Lymphocytes is found in great abundance in the germinal centers.
What do you mean by Lymphocytes?
Lymphocytes are a type of white blood cell that play a major role in the body's immune system. They are responsible for recognizing and responding to foreign substances (antigens) and producing antibodies that help fight off infections. They are also involved in the regulation of immune responses and the development of immunological memory.
In the germinal centers, B cells and T cells undergo antigen-dependent differentiation, maturation, and selection, allowing them to become effective in destroying infected or malignant cells. The lymphocytes in the germinal centers are able to recognize and respond to a wide variety of pathogens, making them essential for immunity against various disease-causing agents.
Hence, option B is correct.
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The evolution of cuticle presented land plants with a challenge that threatened their ability to live on land.Compare and contrast stomata with the pores found in liverworts
Stomata were a crucial development that allowed plants to adapt to life on land, whereas the more primitive liverwort pores represent a more ancestral feature.
Cuticle development was a crucial adaptation that made it possible for plants to survive on land by limiting excessive water loss. This adaptation, nevertheless, also posed a problem because it limited the plant's capacity to exchange gases with the environment. Stomata and pores, which are specialised structures for gas exchange, developed as a result of this.
Plants' epidermis has stomata and pores, two types of structures that facilitate gas exchange. The following comparison and contrast highlights some of the distinctions between these structures, notably in terms of their structure and function:
Structure: Stomata are specialised organs that control the opening and closing of a central pore or aperture. They are made up of two kidney-shaped guard cells. Contrarily, liverwort pores are plain epidermal holes without the two guard cells seen in stomata.
In order to control the entry of carbon dioxide for photosynthesis and the departure of oxygen and water vapour, stomata are specialised for gas exchange. Changes in turgor pressure within the guard cells, which are in turn regulated by external signals like light and humidity, control the opening and closing of stomata. The pores of liverworts have a similar purpose in that they permit gas exchange between the plant and its surroundings, but they lack the guard cells' active regulation in stomata.
Stomata, which are present in all land plants with the exception of liverworts and some mosses, are assumed to have originated in the ancestor of vascular plants. Pores, on the other hand, are a more primitive characteristic that is shared by both liverworts and other non-vascular land plants.
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Sort these nucleotide building blocks by their name or classification.
1. Phosphate
2. Ribose
3. Deoxyribose
4. Purine
5. Pyrimidine
A phosphate group, glycerin, and fatty acids make up phospholipids. These nucleotide building pieces should be sorted by name or category.
What in biology is a nucleotide?
a molecule made up of a sugar, phosphate group, and a nutrient base (adenine, nucleic, thymine, or nucleic acids in Hiv; adenine, guanine, uracil, or pyrimidines in RNA)
Which four types of nucleotides are there?
The two dna strands are held together by these chemical bonds, which function like rungs on a ladder. DNA contains the bases adenine (A), codon (C), guanine (H), and thymine (T) (T). These bases come in particular pairings
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Which example below is a correct statement about Bacteroides thetaiotaomicron, a bacterium that lives in the human intestines?AThe bacteria have a parasitic relationship with the human body.BThe bacteria have a commensal relationship with the human body.CThe bacteria directly create a network of intestinal blood vessels necessary to absorb food.DMany pathogenic strains of B. thetaiotaomicron have emerged.EThe bacteria have a mutualistic relationship with the human body.
Bacteroides thetaiotao micron, a bacterium that lives in the human intestines. The bacteria have a mutualistic relationship with the human body.
Typhi is parasitic on humans and vice versa. Humans and lactobacillus have a mutually beneficial interaction
Infections are brought on by S typhi, which is bad. It damages while feeding off the body and does no good. Hence, it is a parasite.
Lacto bacteria consume food for their own gain, but they also aid in digestion and are safe for humans. Both parties gain from this. The interaction is hence mutual. Both benefit, no damage is done.
This form of interaction is known as mutualism since both parties profit from it. The bacterium that lives in the human intestine and receives food from the person while, on the other side, the person receives vitamins that the bacteria make by eating food. A symbiotic relationship in which both organisms profit from one another is called mutualism.
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In pines, the female gametophyte contains _____, each of which contains a(n) _____.a) archegonia ... eggb) antheridia ... eggc) antheridia ... sperm celld) archegonia ... sperm celle) microsporangia ... egg cell
In pines, the female gametophyte contains archegonia, each of which contains a(n) egg. Here option A is the correct answer.
Pines, like other gymnosperms, have a unique reproductive system. The male and female reproductive structures are found on separate cones, with the male cones producing pollen and the female cones producing ovules.
The female gametophyte, also known as the megagametophyte or embryo sac, is located within the ovule. The female gametophyte contains several archegonia, which are specialized structures that produce and house egg cells. The archegonia are flask-shaped structures with a neck that extends out of the megagametophyte and opens to the outside of the ovule.
Fertilization in pines occurs when pollen grain land on the exposed tip of the archegonium and produces a pollen tube, which grows down into the archegonium. The sperm cells, which are produced by the male gametophyte (pollen), travel down the pollen tube and fertilize the egg cell within the archegonium. The fertilized egg develops into an embryo, which eventually grows into a new pine tree.
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Which of the following are factors that limit enzyme activity?
The factors that limit enzyme activity are change in temperature, pH, substrate concentration and binding of specific chemical to enzyme. Therefore, the correct option is A.
What is enzyme?It is a protein that acts on substances referred to as substrates to catalyze the biological processes of metabolism.
The enzyme must initially bind to the substrate in order to begin its catalytic activity, which is constrained by a variety of variables such substrate concentration and temperature, pH, substrate concentration and binding affinity.
Therefore, we may draw the conclusion that the data indicates that temperature and increased substrate are variables that restrict enzyme activity.
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The question is incomplete, but most probably the complete question is,
Which of the following factors can affect the enzymatic activity?
A. Change in temperature
B. Change in pH
C. Change in substrate concentration
D. Binding of specific chemical to enzyme
A) A, B, C, D
B) A, B, D
C) A, B
D)B, C, D
Which of the following mutations results in the repeating of a section of DNA?
O Inversion
O Deletion
O Duplication
O Translocation
The mutation that results in the repeating of a section of DNA is a Duplication.
What is mutation?
A mutation is a change in the DNA sequence of a cell's genetic material. Mutations can be caused by errors during DNA replication, exposure to environmental factors such as radiation or chemicals, or by mutations in specific genes that regulate DNA replication or repair.
Mutations can range in size from a single base pair to a large segment of a chromosome, and can have a variety of effects on an organism, ranging from having no effect to causing a genetic disorder. Some mutations can also be beneficial, providing an organism with new traits or abilities that can increase its chances of survival in a changing environment.
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Question:
According to the fluid mosaic model of membranes, membranes consist of___
1. a fluid phospholipid bilayer in which carbohydrates are embedded.
2. mainly phospholipids with scattered nucleic acids.
3. a fluid phospholipid bilayer in which proteins are embedded.
4. a lipid-protein sandwich.
Membranes:
Membranes are structures that generally act to keep things separate. They can be found on a cellular level, like the membranes described by the fluid mosaic model, but also on a larger scale like in the human body. The permeability of these membranes may differ depending on their function (e.g. protection, lubrication, etc).
The fluid phospholipid bilayer in which proteins are embedded is what makes up a membrane, according to the fluid mosaic theory of membranes.
The fluid mosaic model has how many layers?The plasma membrane of animal cells is modeled using a fluid mosaic. These cells' plasma membrane is composed of two layers (a bilayer) of phospholipids, which are fats with phosphorus attached and, at body temperature, resemble vegetable oil (fluid).
What two elements make up the fluid mosaic model?A phospholipid's head and its two tails are its two most significant components. Molecular phosphate makes up the head and is drawn to water (hydrophilic). Fatty acids, which are chains of carbon atoms, make up the two tails and are incompatible with or resist water (hydrophobic).
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the volume of blood that leaves the ____________ must be close to the volume that returns.
The volume of blood that leaves the Capillary must be close to the volume that returns.
Capillaries are thin walled, highly branched vessels that feed the tissues and collect wastes to be carried back to the lungs, liver, or kidney for elimination. Capillaries empty into the venules, which in turn drain into the veins that lead back to the heart.
More specifically, capillaries are located between arteries and veins. Arteries function to transport blood away from the heart and towards the various cells and tissues of the body. As the arteries get farther away from the body, they get smaller and more narrow, eventually turning into arterioles.
Capillaries empty into the venules, which in turn drain into the veins that lead back to the heart. Veins carry deoxygenated blood to the lungs to pick up more oxygen, and then back to the heart once again.They transport blood, nutrients and oxygen to cells in your organs and body systems. Capillaries are the smallest blood vessels in your vascular system.
The capillaries are about 8 to 10 microns in diameter, just large enough for red blood cells to pass through them in single file.
There are three types of capillary:
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the lh surge is caused by ________.
Once the ovum reaches a specific size range, pituitary gland releases luteinizing hormone (LH). So LH surge is caused due to ovulation.
Luteinizing hormone is released by the pituitary gland when the ovum almost reach maturity. LH then helps in maturation of egg and its release. Release of the egg from the follicle is called Ovulation. LH surge means the high amount of LH in both blood stream and urine, and this happens around ovulation.
After ovulation the menstrual cycle reaches luteal phase, where the body prepares for fertilization. The uterine line is thickened. If the egg is not fertilized mensuration follows the luteal phase.
The LH level falls post the ovulation. So LH surge is caused by ovulation.
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Where is dense irregular connective tissue located predominantly?
a. papillary layer of the dermis
b. hypodermis
c. epidermis
d. reticular layer of the dermis
It is the dermis, the layer of the skin that lies beneath the epidermis tissue. It has fibroblasts and collagen fibres.
The reticular layer, also known as the deep layer of the dermis, comprises the majority of such a type of connective tissue. Additionally, it can be found in the sclera and deeper skin layers. It is referred to as dense irregular if the collagen fibre bundle in the connective is oriented irregularly. Heart valves, joint capsules, the pericardium, endosteum, periosteum, and deep layers of the skin's dermis all contain or are formed of dense irregular connective tissue. Tough, substantial, fibrous proteins called collagen fibres are present in dense tissues. There are many different varieties, but type I collagen predominates in dense connective tissue.
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What are the rungs of the DNA ladder made up of?
The four bases—thymine (T), aniline (A), pyrimidines (C), and guanine—are created by different atom combinations (G). These bases make up the DNA ladder's rungs.
Are phosphate bases used to build the rungs of DNA?DNA's sides or backbone is made up of phosphate groups and sugar molecules. Nitrogenous bases make up the DNA's rungs or steps. The four different types of nitrogenous bases are adenine, guanine, thymine, and cytosine.
What are the three mRNA bases called?Codons are collections of three mRNA nucleotides known as codons. An anticodon, or complementary set of nucleotides, exists for each codon. The molecules of trnas (tRNA) contain anticodons.
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Which of the following describes the biological school of animal welfare?
A. Experiencing fear and distress
B. How healthy the animal is and how it grows and reproduces
C. Environmental conditions
D. Express natural behaviors
Answer: B. How healthy the animal is and how it grows and reproduces
Explanation: It focuses on the physical wellbeing of an animal, also includes its reproduction, growth rate, and more.
The first plants were organisms we now refer to asA. liverwortsB. mossesC. pinesD. algaeE. cycads
The first plants were organisms we now refer to as : A. liverworts.
What were first plants?The first plants were most likely similar to modern-day liverworts and mosses. These plants are simple and non-vascular organisms that lack true leaves, stems, and roots.
They were also among the first land plants to evolve, and are believed to have appeared on Earth around 470 million years ago during Ordovician period. Algae, cycads, and pines evolved later in the history of the plant evolution.
Non-vascular plants that include mosses and liverworts, were the first-ever land plants and they do not have much of an internal support system, but have slightly simpler material for the same tasks.
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How does saturation affect membrane fluidity?
Saturation affects membrane fluidity through the absence of double bonds.
Membrаne fluidity is аffected by fаtty аcids. More specificаlly, whether the fаtty аcids аre sаturаted or unsаturаted hаs аn effect on membrаne fluidity. Sаturаted fаtty аcids hаve no double bonds in the hydrocаrbon chаin, аnd the mаximum аmount of hydrogen. The аbsence of double bonds decreаses fluidity, mаking the membrаne very strong аnd stаcked tightly. Unsаturаted fаtty аcids hаve аt leаst one double bond, creаting а "kink" in the chаin. The double bond increаses fluidity. Membrаne fluidity is аlso аffected by cholesterol. Cholesterol cаn mаke the cell membrаne fluid аs well аs rigid.
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evidence of an organism that is more than ______ years old is called a fossil.
The evidence of an organism that is more than approximately 10,000 years old is called a fossil.
What is fossil?A fossil is the preserved remains or traces of an organism that lived in the distant past. Fossils can be the physical remains of an organism, such as bones, shells, teeth, or plant material, or they can be traces left behind by an organism, such as imprints or tracks. Fossils can provide important information about the history of life on Earth, including the evolution of different species, the environments in which they lived, and the geological history of the planet. Fossils are formed when an organism is buried by sediment and is preserved through a process called fossilization. In some cases, the organism is replaced by minerals, leaving behind a rock-like replica of its shape, known as a petrified fossil. In other cases, the organism's remains are compressed, leaving behind a thin carbon film known as a carbonaceous fossil. Fossils can be found in sedimentary rocks, such as sandstone or shale, or in other types of rocks, such as volcanic ash or limestone.
Here,
This includes the preserved remains or traces of organisms such as bones, shells, imprints, or tracks that have been buried and preserved in sediment or rock.
Fossils provide important clues about the history of life on Earth, including the evolution of different species, the environments in which they lived, and the geological history of the planet.
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Where is dense irregular connective tissue located predominantly?a. papillary layer of the dermisb. hypodermisc. epidermisd. reticular layer of the dermis
Option d) The reticular layer of the dermis is the deeper portion of the dermis. It consists of dense irregular connective tissue containing collagen and elastic fibres.'
Contrary to dense regular connective tissue, which contains fibers organized in parallel bundles, dense irregular connective tissue does not.
The majority of the fibers in dense, uneven connective tissue are collagen fibers. Compared to loose connective tissue, it contains less ground material. The majority of the cells are fibroblasts, which are sparsely distributed throughout the tissue.
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What are characteristics of simple squamous epithelium?
A form of epithelial tissue known as simple squamous epithelium is made up of a single layer of thin, flattened cells.
These are a few of this tissue's characteristics:
Simple squamous epithelium cells are thin and flat with a flattened, atypically formed nucleus.
A single layer of closely packed cells with very little extracellular matrix makes up the cell arrangement.
Function: The lining of blood arteries, lung alveoli, and the Bowman's capsule of the kidney are just a few places where simple squamous epithelium is present. It is also involved in filtration, secretion, and diffusion.
Simple squamous epithelium cells have a smooth, flat apical (top) surface, which decreases friction and makes it possible for molecules to pass easily through the tissue.
Basal surface specialisation: The simple squamous epithelium's basal (lower) surface typically comes into touch with a basement membrane, which aids in securing the cells to the connective tissue beneath.
Simple squamous epithelium offers only minimal protection since the cells are so sensitive and readily killed or damaged by mechanical or chemical stress. However, due to the tissue's thinness, chemicals and gases can move over it effectively.
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Which of the following statements is NOT true about stage 3 of the birthing process.
A. The placenta and umbilical cord are delivered.
B. It lasts approximately 5 to 10 minutes.
C. Intense contractions occur.
D. The placenta remains intact.
Please select the best answer from the choices provided.
OA
B
C
OD
The statements that is not true about stage 3 of the birthing process is that there C. Intense contractions occur.
What is the birthing process?It involves four stages of labor: the cervix shrinking and opening during the first stage, the baby's descent and birth during the second, the placenta being delivered during the third, and the mother and child recovering during the fourth stage, known as the postpartum.
let's quickly review the three stages of labor. True labor contractions begin the first stage, which concludes when the cervix is fully effaced and dilated. The baby is born at the conclusion of the second stage, which is the pushing period. The placenta is delivered to complete the third stage.
Therefore, option C is correct.
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_______ is a movement that increases the angle between two body parts such as moving a limb from a bent to a straight position
Extension is a movement that increases the angle between two body parts such as moving a limb from a bent to a straight position.
What is extension movement?Extension is a movement that increases the angle between two body parts, often requiring the movement of a limb or body portion away from the body's centre line. This movement can occur in a variety of joints, including the elbow, knee, and hip, as well as the spine. Extension is the inverse of flexion, which reduces the angle between two bodily components.
Extension is vital for many physical activities, including running, leaping, and throwing, and is a major component of many workouts and sports. Proper extension can aid to enhance flexibility, balance, and general physical fitness and is frequently addressed through stretching and strength training activities.
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Organs are made up of several different types of ____ that function together.A. tissues
B. dendrites
C. regeneration
D. synovial
The correct option is A. Organs are made up of several different types of tissues that function together.
In biology, a tissue refers to a group of similar cells that work together to perform a specific function in an organism. Tissues can be found in animals, plants, and even some unicellular organisms.
There are four main types of animal tissues: epithelial, connective, muscle, and nervous tissue. Epithelial tissue covers and protects the surfaces of the body, while connective tissue provides support and connects different structures. Muscle tissue contracts and generates movement, and nervous tissue transmits signals throughout the body.
In plants, there are three main types of tissues: dermal, ground, and vascular tissue. Dermal tissue covers and protects the plant, while ground tissue makes up the bulk of the plant and performs various functions such as photosynthesis. Vascular tissue is responsible for transporting water and nutrients throughout the plant.
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Please Help me. I need the answer asap
Answer:
first one
Explanation:
meiosis-- is the division of sex cells
mitosis-- is the division of body cells
This is commonly known as Growth Plates
Multiple choice:
spongy bone
yellow marrow
Epiphyseal Line
Articular Cartilege
Option 3 is Correct. The term "growth plates" refers to the epiphyseal line. Children who are growing have cartilage discs called growth plates, often known as physes or epiphyseal plates.
Long bones like those in the arms and legs, which are placed between the middle and the tip, contain them. In most cases, the ends of long bones have one growth plate apiece. Children and adolescents' growth plates are the sites of new bone growth.
Cartilage, a flexible, rubbery material, makes up their body (the nose, for instance, is made of cartilage). The majority of growth plates are found near the ends of long bones. Each end of a long bone has a larger part called an epiphysis that is packed with crimson marrow and spongy bone.
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Correct Question:
This is commonly known as Growth Plates
Multiple choice:
1. spongy bone
2. yellow marrow
3. Epiphyseal Line
4. Articular Cartilege
what plant is most important to you? and then give several reasons why you think that is true.
Answer:
The plant that is most important to me is the bamboo tree. Bamboo is a versatile, environmentally friendly, and sustainable resource that can be used for a variety of purposes. It is very fast-growing and requires very little maintenance, making it an ideal choice for those who want to contribute to sustainability. Additionally, bamboo is incredibly strong and durable while being lightweight, so it can be used to build furniture or as a material for construction projects. Finally, bamboo can also be used to create textile materials which makes it an invaluable resource for people in need of clothing. Therefore, due to its versatility, durability, and sustainability, the bamboo tree is an incredibly important plant in my mind.
Answer:
Green leaves
Explanation:
it helps in taking co to so we can breathe good oxygen
[TRUE or FALSE] left ventricular contraction propels blood through which valve?
The left ventricular contraction propels blood through the aortic valve. So the statement is true.
It is located between the left ventricle and the aorta. The heart's pumping system is dependent on the left ventricular contraction to effectively transport oxygen-rich blood to the body's tissues.
The left ventricle contracts, shortening its muscle fibers and reducing its volume, which raises the pressure inside the chamber.
For the body to function properly in terms of blood flow and blood pressure, the left ventricular contraction's force is crucial.
Assessing the function of the left ventricle is an important part of many cardiac evaluations.
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stored energy that can be used to do work is called energy, while energy of motion that is being used to do work is called energy.
Stored energy that can be used to do work is called potential energy, while energy of motion that is being used to do work is called kinetic energy.
Potential energy is a form of energy that can be used to perform work, whereas kinetic energy is energy in motion that is now performing work.
Potential energy is the energy that an object possesses due to its position or condition, while kinetic energy is the energy that an object possesses due to its motion. Both forms of energy are fundamental concepts in physics and are important for understanding a wide range of phenomena, from the behavior of individual particles to the motion of planets in our solar system
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With respect to membrane proteins, how does a pump differ from a channel or a carrier?
A. Pumps require energy for transport, but channels and carriers do not use energy.
B. Pumps are proteins, but channels and carriers are formed by a special arrangement of phospholipids and cholesterol.
C. Pumps are integral membrane proteins, while channels and carriers are peripheral membrane proteins.
D. Pumps cannot create a concentration gradient, but channels and carriers can.
The correct option is A; Pumps require energy for transport, but channels and carriers do not use energy.
A pump varies from a channel or a carrier in terms of membrane proteins because A. Pumps require energy to transport, whereas channels and carriers do not. Pumps are thus classified as active transporters.
Channel proteins are proteins that form hydrophilic pores in cell membranes, allowing molecules to move down the concentration gradient. Carrier proteins are membrane proteins that transport substances both down and up the concentration gradient.
Channel proteins, on the other hand (see the following section), produce open pores through the membrane, allowing unimpeded diffusion of any molecule of the proper size and charge. Carrier proteins enable the diffusion of sugars, amino acids, and nucleosides across the plasma membranes of the majority of cells.
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The tendons of ____ split to allow passage of the ____ tendons to attach to the distal phalanges.
The superficialis flexor digitorum tendons pass through the Flexor digitorum tendons and join to the distal phalanges.
Which muscles cause the phalanges to shorten and lengthen?Extensor digitorum connects the middle four phalanges of a hand to the lateral aspect of the humerus. This creates the pull necessary for the four medial fingers' approach and both joint joints to extend. The extensor digitorum helps the wrist extend as well.
How many and where do the hand's flexor tendons attach?nine lengthy flexor tendons travel from the forearm via the wrist's carpal tunnel. They split in the palm, going to each finger twice before at the Base and once at the tip.
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which type of lipid is most commonly found in both food and in the body?
a- triglyceride
b- complex
c- phospholipids
d- sterold
The lipid that is most commonly found in both food and in the body is a- triglyceride.
The principal lipids in meals and saved withinside the frame as fats are the triglycerides, which encompass 3 fatty acids connected to a spine of glycerol (an alcohol). Cholesterol, the maximum ample steroid lipid withinside the frame, is needed in each mobileular withinside the frame. The frame receives most effective a small quantity of its ldl cholesterol via meals, the frame generating maximum of it. It performs a position in mobileular restore and the formation of latest cells. Triglycerides are the primary kind of nutritional fats and the maximum not unusualplace kind of lipid withinside the frame. Like LDL cholesterol, triglycerides may be made withinside the liver and acquired from the diet.
Thus, the correct option is a.
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DNA structure quick lab
Answer:
double helix
Explanation:
which feature for obtaining water and minerals comes after the nonvascular plants in a phylogeny of the land plant?A. leaflike structuresB use of capillary actionC. extensive root systemD. small sizeE. growth in low, dense mats
Feature for obtaining water and minerals comes after nonvascular plants in phylogeny of the land plant is : C. extensive root system.
What are nonvascular plants ?Nonvascular plants like mosses, liverworts, and hornworts, lack true roots and rely on the direct absorption of water and nutrients through the entire body surface.
Whereas, vascular plants have specialized tissues for transporting water and nutrients, and roots play a critical role in accessing water and minerals from the soil. As plants evolved, development of extensive root system allowed for more efficient absorption and transport of water and minerals, which helped them to grow larger and more complex.
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