which bacteria grow on the agar plate of the ames test is positive?
It is a biological experiment used to evaluate the mutagenesis potential of chemical substances.
A positive test result shows that the chemical is mutagenic and so may operate as a carcinogen, as cancer is frequently connected to mutation. Many bacterial strains are regularly used in the Ames assay.
At GC base pairs, Salmonella typhimurium cells detect base-pair substitution and frameshift mutations, whereas Escherichia coli strains detect damage at AT base pairs. The Ames test is a carcinogen test. It is used to pinpoint the chemical component responsible for mutation. It's a kind of biological test.
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I need to know what does it mention to have cancer
Answer:
Cancer is a disease in the cells of a human body
Explanation:
Suppose you're analyzing a newly discovered unicellular organism to determine whether it should be classified as a prokaryote or eukaryote. How should you approach it?
In the nucleus of eukaryotes, genetic material is stored. Unlike eukaryotic cells, prokaryotic cells lack membrane-bound organelles (including the nucleus and mitochondria).
How can you tell whether a single cell is prokaryotic or eukaryotic?Prokaryotic and eukaryotic comparison-
Eukaryotic cells contain a membrane-bound nucleus, whereas prokaryotic cells do not, and this is the main difference between these two types of organisms. Eukaryotes keep their genetic information in the nucleus.
How does one define a eukaryotic cell in a unicellular organism?Single-celled or multicellular eukaryotes are both possible. By having internal membranes that divide certain eukaryotic cell components from the remainder of the cytoplasm, eukaryotes are distinguished from the prokaryotes, another group of creatures. Organelles are the name for these membrane-bound objects.
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The external reproductive structure of an insect male is called? a) Oviposotor b) Aedeagus c) Antennae d) Cerci
Male gonopore is found on the phallus , which is also the end of the ejaculatory duct.
What does an insect male's external reproductive system look like?The male reproductive system normally consists of two testicles that link to two seminal vesicles in pairs and an ejaculatory duct in the middle. The majority of insects also have a number of auxiliary glands that open into the ejaculatory duct or the vasa deferens.
What exactly do insects' external reproductive organs look like?The vulva is where it opens up externally. Many insects have a narrow vulva, which turns the genital chamber into an enclosed pouch or tube known as the vagina. Ectodermal glands of two different types enter into the vaginal cavity. The spermatheca, which houses spermatoza, is the first until they are needed for egg fertilization.
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What can some gram positive bacteria do in response to harsh and nutrient limited environments?A. Form an endosporeB. Form cell wallsC. Self-destructD. Grow flagella
The correct option is A ; . Form an endospore , Gram-positive organisms with dynamic cell envelopes, such as the pathogens Staphylococcus aureus,.
Streptococcus pneumoniae, and Enterococcus faecalis, mediate interactions with the environment and serve as the first line of defense against hazardous chemicals.
Some bacteria create an endospore, a form of spore that can endure extremes such as boiling and freezing temperatures, as well as UV light. These bacterial endospores are frequently subjected to years of suffering before they discover the growth conditions required for germination.
Gram-positive bacteria have lately been found as key components of freshwater ecosystems, as well as being prevalent in marine habitats. However, their quantitative significance and potential function in these latter systems, particularly in coastal locations, has received little attention.
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parthenogenic reproduction is seen in which insect?
In a process called parthenogenesis, an egg can become an embryo without being fertilised by a sperm.
What kind of reproduction uses parthenogenesis?Animals without sex chromosomes include ants, bees, and wasps. By parthenogenesis, these organisms reproduce. A few types of fish, reptiles, and plants can also reproduce in this way. Some organisms, like crayfish, snakes, komodo dragons, and sharks, have the ability to reproduce both sexually and through parthenogenesis.
Do insects use parthenogenesis to reproduce?The reproduction method used by a number of insects, such as the soybean aphid and the alfalfa snout beetle, is known as parthenogenesis. The Alfalfa Snout Beetle can only exist as females because to this procedure.
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A water biome includes waters that are flowing quickly downhill. The water has very little salt. Photosynthetic organisms grow
where there is sunlight. Plankton is an important food source. Which characteristic identifies this biome as either freshwater or marine?
A. plankton are a food source
B. Photosynthetic organisms
C. water with very little salt
Water with very little salt identifies this biome as either freshwater or marine. Therefore, option (C) is the correct answer.
What is a water biome?A water biome is a type of ecosystem that is dominated by bodies of water, such as oceans, lakes, rivers, and wetlands. These biomes are home to a diverse range of flora and fauna, including fish, crustaceans, mollusks, amphibians, reptiles, birds, and mammals. Water biomes are influenced by factors such as temperature, salinity, and currents, and can be divided into subcategories based on their physical and biological characteristics.
They play a crucial role in the Earth's climate, carbon cycle, and biodiversity, and are subject to threats from pollution, overfishing, and climate change.
Therefore, option (C) is the correct.
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ferns, like bryophytes and lycophytes, can only survive in places that are constantly wet. (T/F)
Ferns, like bryophytes and lycophytes, can only survive in places that are constantly wet is a false statement.
What are Bryophytes?
Liverworts have the simplest bodies of all the green plants. The gametophyte, the dominant stage, looks like a flat scaly leaf, with prominent lobes.
It looks for all the world like a tiny flattened liver, hence the scientific name hepatico-phyta, liver plant. During the Middle Ages, this similarity caused physicians to prescribe liverwort for diseases of the liver.
According to the Doctrine of Signatures the Creator had designed all of nature, including plants, with our welfare in mind. People believed that plants had been intentionally designed to resemble the organs of the body they were supposed to heal.
Therefore, Ferns, like bryophytes and lycophytes, can only survive in places that are constantly wet is a false statement.
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monomers for the synthesis of dna are called __________.
The monomers for the synthesis of DNA are called nucleotides.
The sequence of nucleotides in a DNA molecule provides the genetic code for the synthesis of proteins and other cellular components.
A nucleotide is composed of a sugar molecule (deoxyribose), a phosphate group, and a nitrogenous base. There are four different nitrogenous bases found in DNA: adenine (A), guanine (G), cytosine (C), and thymine (T). The sequence of these nitrogenous bases in a DNA molecule determines the genetic information encoded in that DNA molecule. During DNA synthesis, nucleotides are added one by one to the growing DNA chain in a specific order, based on the complementary base pairing rules (A pairs with T, and C pairs with G). This process, called DNA replication, is essential for the transfer of genetic information from parent cells to daughter cells during cell division.
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Gregor Mendel conducted several investigations using pea plants. He developed the Law of Independent Assortment based on the evidence produced from his experiments. Which of the following is contributed to this law?
A. greater strength of dominant alleles
B. final stages of gametogenesis
C. random fertilization of gametes
D. genetic variation withing species
Gregor Mendel developed the Law of Independent Assortment based on the evidence produced from his experiments because D. genetic variation within species contributed to this law.
What is the Law of Independent Assortment developed by Mendel?The Law of Independent Assortment developed by Mendel indicates that the alleles of a gene are inherited independently from other alleles on another gene.
Therefore, with this data, we can see that the Law of Independent Assortment developed by Mendel indicates the independence in the transmission of inherited characters or genes during fecundation.
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why are individual chromosomes visible only during mitosis
When cells divide, or go through mitosis, the chromosomes are significantly compressed and become visible as distinct, black objects inside the cell nuclei.
What is a cell?Biologically speaking, the smallest unit that can support life on its own and makes up all living things, including the tissues of the body. The three main parts of a cell are the cytoplasm, nucleus, and cell membrane. The cell membrane keeps chemicals within and outside of the cell under control.
Who Defined a cell?Robert Hooke stumbled upon the cell in 1665. Robert Hooke examined a piece of bottle cork under a compound microscope and discovered tiny structures that resembled little dwellings. He therefore referred to these "rooms" as cells.
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List 3 things that could reduce the population of an animal species
Increased sympathetic stimulation causes vasodilation, bringing elevated blood pressure back to normal. A) True B) False
Increased sympathetic stimulation causes vasodilation, bringing elevated blood pressure back to normal. The above statement is False.
In sympathetic stimulation, nervous system gets activated which increases heart's speed, which in result delivers more blood to the areas of the body that needs more oxygen and perform other responses to help the body come out of the danger which is performed by vasoconstriction.
Vasoconstriction plays role in stressful situations which increasing the blood pressure and speed of the heart.
In conclusion, sympathetic stimulation causes vasoconstriction.
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what cellular process uses glucose and oxygen to produce atp?
The process through which the glucose in the food you eat is transformed into ATP, and subsequently into energy, is known as cellular respiration. Both glucose and oxygen are reactants in cellular respiration.
What two biological mechanisms convert glucose into ATP?All living things, both heterotrophs and autotrophs, have breathing cells. To create ATP, they all metabolise glucose. Cellular respiration is made up of three processes: electron transport, glycolysis, and the Krebs cycle, also called the citric acid cycle.
What process converts glucose into ATP?From glucose and oxygen, aerobic respiration creates ATP, as well as carbon dioxide and water. Chemicals other than oxygen are used during anaerobic respiration, which is predominantly employed by bacteria and archaea.
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mutations occur at a rate of 1 per 1010 base pairs per generation. s. aureus has 2.8 x 106 base pairs in its genome. therefore, approximately 0.0028 mutations will occur per cell in the population. at the end of 12 hours, how many mutations will be present in the population of s. aureus in the wound in your foot?
As a result, after 12 hours, we would anticipate roughly 27 mutations to be present in the S. aureus population in your foot wound.
What is mutations?Mutations are changes in the DNA sequence of an organism's genome. DNA is the genetic material that contains the instructions for the development and function of all living organisms. Mutations can occur spontaneously during DNA replication, or they can be induced by environmental factors such as radiation, chemicals, or viruses. Mutations can range in size from a single nucleotide to large-scale rearrangements of chromosomes.
Here,
To solve this problem, we need to know the size of the S. aureus population in the wound in your foot. Let's assume for the sake of simplicity that the population size is 1 million (1 x 10^6) cells.
The expected number of mutations per cell in one generation is:
1 mutation per 10¹⁰base pairs
S. aureus has 2.8 x 10⁶ base pairs in its genome
Therefore, the expected number of mutations per cell per generation is:
(2.8 x 10⁶) / (10¹⁰) = 2.8 x 10⁻⁴ mutations per cell per generation
To calculate the number of mutations in the population after 12 hours, we need to know the number of generations that have passed. S. aureus has a generation time of approximately 30 minutes, so the number of generations in 12 hours is:
12 hours x (60 minutes/hour) / (30 minutes/generation)
= 24 x 4
= 96 generations
The expected number of mutations per cell in 96 generations is:
96 generations x 2.8 x 10⁻⁴ mutations per cell per generation
= 0.027 mutations per cell
To calculate the total number of mutations in the population, we need to multiply by the number of cells in the population:
0.027 mutations per cell x 1 x 10⁶ cells = 27 mutations
Therefore, after 12 hours, we would expect approximately 27 mutations to be present in the population of S. aureus in the wound in your foot.
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It is permissible to enter an excavation to get a soil sample. True or False
Answer:
False
Explanation:
how does a non-competitive inhibitor decrease the rate of an enzyme reaction?
By interacting with the enzyme's active site and blocking the regular substrate from binding. by attaching to an allosteric site, causing the enzyme's active site to change in form.
By lowering the reaction's free-energy change, which is mediated by the enzyme. An inhibitor may adhere to an enzyme and prevent the substrate from binding, for instance by adhering to the active site. Because the inhibitor "competes" with the substrate for the enzyme, this is known as competitive inhibition.
In other words, at any one time, only the inhibitor or the substrate can be bound. Competitive enzyme inhibitors compete with the substrate for the enzyme's active site by having a shape that is similar to the substrate molecule.
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gram stain is a laboratory technique used to distinguish between various kinds of bacteria based on the characteristics of the ______________.
Gram stain is a laboratory technique used to distinguish between various kinds of bacteria based on the characteristics of the cell wall.
A Gram stain is a take a look at used to perceive micro organism. It is one of the maximum not unusualplace approaches to fast diagnose bacterial contamination withinside the body. A Gram stain is coloured red. When the stain combines with micro organism in a sample, the micro organism will both live red or flip red or red. If the micro organism remains red, they're Gram-high-quality. If the micro organism turns red or red, they're Gram-negative. Gram high-quality micro organism stain violet because of the presence of a thick layer of peptidoglycan of their cell walls, which keeps the crystal violet those cells are stained with. The essential advantage of a gram stain is that it allows your physician analyze when you have a bacterial contamination, and it determines what sort of micro organism are inflicting it.
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estimate the osmolarity of the potato tuber tissue
The osmolarity of potato tuber tissue can vary depending on various factors such as the potato variety, the stage of growth, and environmental conditions. However, the typical osmolarity range for potato tuber tissue is approximately 0.2 to 0.5 osmol/L.
It is important to note that the osmolarity of potato tuber tissue can also be affected by the method used to measure it. Therefore, the actual osmolarity value may vary depending on the experimental procedure used.
In order to get a more accurate estimate of the osmolarity of potato tuber tissue, it is recommended to perform experimental measurements using a reliable method such as freezing point depression or vapor pressure osmometry.
Overall, The estimate osmolarity of the potato tuber tissue is approximately 0.2 to 0.5 osmol/L.
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________. also known as the horizontal plane, is the plane that divides the body into an upper and lower portion.
The plane that divides the body into an upper and lower portion is called the transverse plane. This plane is also known as the horizontal plane, and it runs perpendicular to the sagittal and coronal planes.
The transverse plane divides the body into superior and inferior portions, with the superior portion being above the plane and the inferior portion being below it.
The transverse plane is important in medicine and anatomy, as it is often used to visualize and analyze cross-sectional images of organs and structures within the body. Techniques such as computed tomography (CT) and magnetic resonance imaging (MRI) utilize the transverse plane to produce detailed images of the body in cross-section.
In addition, the transverse plane is useful in surgical procedures that involve the abdomen or pelvis, as it allows for access to the organs and structures in the lower portion of the body.
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What is the advantage of using a pressure relief valve to protect a receiver instead of a fusible plug?
A) Pressure relief valves are less expensive.
B) The pressure relief valve resets itself.
C) Pressure relief valves can also be used to check the receiver pressure.
D) It is impossible for a pressure relief valve to malfunction.
When both solenoids are turned on simultaneously, pump flow is sent to the cylinder until the maximum relief pressure is reached. Before blocking, a solenoid shutoff valve always displays a small delay.
Pump: what is it?
Pump definition (Page 2 of 3) unchanging verb. 1: to operate a pump: use a pump to elevate or move a fluid. 2: to push oneself as though pumping something. 3. to behave in a way that mirrors how a pump handle might. verb in transit. 1 a: to use a pump to lift (anything, such as water). b: to use a pump to pull fluid from.
What categories fall under pumps?
Pump classification. Pumps are divided into different categories based on how fluid is given energy. The fundamental techniques are volumetric displacement, kinetic energy addition, and electromagnetic force application. A fluid can be moved mechanically or using the assistance of another fluid.
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Which of the following can undergo budding?
A. cells in a dog
B. cells in a plant
C. amoeba
D. yeast
Option D. yeast can undergo budding, which is a type of cell division.
What is the cell division process of budding?The cell division process of budding is a species type of mechanism by which years generate other cells when daughter cells pinch, ie bud, off from the mother cell, in a process that is deficient to generate rapidly more cells in a given organism such as in this case yeast.
Therefore, with this data, we can see that daughter cells bud off the mother cell in order to generate more cells via budding.
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why dangerous fungi are spreading across u.s. as temperatures rise?
Dangerous fungi are spreading across U.S. as temperature rises because of the adapting mechanisms they are undergiing towards climate change.
The fungi, those who were safe for human health previously, have now initiated to cause health hazards in humans. This may be the cause due to the adapting mechanisms they have undergone towards the climate change in United States. The fungi usually were not able to thrive intense temperatures. But as of now, they have started enduring such temperatures and are effective in causing fungal infections.
Deaths by fungal infections have increased. Around 25 to 30 degrees Celsius was the ideal temperature for bacterial and fungal growth rates, whereas lower values were seen at higher temperatures. They can now survive higher temperatures like that of normal temperatures of human bodies, or 37° C.
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which thermometer is used to measure surface temperatures?
Surface temperatures are measured using infrared thermometers.
Infrared thermometers are commonly used to measure surface temperatures as they can quickly and accurately measure temperature without making contact with the surface
There are several types of thermometers that can be used to measure surface temperatures, but the most commonly used type is an infrared thermometer, also known as a non-contact thermometer or a pyrometer.
Infrared thermometers measure the temperature of a surface by detecting the infrared radiation emitted from it. They work by measuring the amount of infrared radiation that is emitted by the surface and converting that measurement into a temperature reading. The advantage of using an infrared thermometer is that it does not need to make contact with the surface being measured, which means it can be used to measure the temperature of objects that are difficult to reach or that are in motion, such as moving machinery or food on a hot grill. Infrared thermometers are also fast, accurate, and easy to use, making them a popular choice for a wide range of applications, from industrial and scientific settings to home use.
In addition to infrared thermometers, there are other types of thermometers that can be used to measure surface temperatures. For example, contact thermometers, such as thermocouples and resistance temperature detectors (RTDs), can be used to measure the temperature of a surface by making physical contact with it. These types of thermometers are often used in laboratory and industrial settings where high accuracy is required. However, they may not be suitable for measuring the temperature of surfaces that are difficult to reach or that are in motion.
Overall, the choice of thermometer for measuring surface temperatures will depend on the specific application, the accuracy and precision required, and the temperature range being measured. In many cases, an infrared thermometer will be the most convenient and practical choice, but in other cases, a contact thermometer may be more appropriate.
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The Lacks had no idea that their mother's cells had been harvested and used in research until 25 years
or so after her death. The family was devastated to learn this and had no understanding of what
happened or why. How do you think this could have been avoided? What responsibilities did the
medical researchers, Johns Hopkins, and other institutions have toward the family?
The way that this would have been avoided based on the use of the cells for research would have been through informed consent.
What would have happened through informed consentThe situation involving Henrietta Lacks and her family could have been avoided if the medical researchers, Johns Hopkins, and other institutions had been transparent about their actions and followed ethical guidelines for informed consent.
Informed consent is the process of obtaining agreement from a person to participate in research. This involves providing the person with information about the study, including what will be done, the potential risks and benefits, and the person's rights as a participant. If a person agrees to participate, they sign a consent form.
In Henrietta Lacks' case, her cells were harvested without her knowledge or consent, which was a violation of her rights as a research participant. If the researchers had obtained informed consent, they could have explained the purpose of the study and the potential uses of Henrietta's cells. They could have also informed her that her cells would be used in ongoing research and might be commercially exploited.
The medical researchers, Johns Hopkins, and other institutions had a responsibility to be transparent about their actions and to respect Henrietta Lacks' rights as a research participant. They also had a responsibility to provide her family with information about the use of her cells and to address any questions or concerns they had.
In the future, it is important for medical researchers and institutions to follow ethical guidelines for informed consent and to be transparent about their actions. This helps to ensure that the rights of research participants are respected and that their families are not caught off guard by unexpected discoveries.
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How does phospholipids with unsaturated hydrocarbon chains affect membrane fluidity?
Because there are more kinks, fluidity is increased. Membrane fluidity is caused by a variety of variables.
When unsaturated fatty acids are compressed, the "kinks" in their tails push nearby phospholipid molecules apart. This "elbow room" prevents the membrane from "freezing" or solidifying at temperatures where membranes without tails of saturated fatty acids in their phospholipids would otherwise do so. In a chilly climate, the membrane's relative mobility is crucial. Saturated fatty acid-based membranes are often compressed in a cold environment, becoming less fluid and more prone to rupturing. Many animals, including fish, are able to adapt to cold settings by altering the amount of unsaturated fatty acids in their membranes in reaction to the drop in temperature.
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Based on their shape, the bones of the Cranium can be classified as what type of bone?
a. flat bones
b. long bones
c. irregular bones
d. short bones
a. flat bones. The bones of the Cranium are flat bones based on their shape.
Flat bones are thin and have a broad surface that provides protection and a place for muscle attachment.
The bones of the Cranium, or skull, are flat bones that protect the brain and other organs of the head. The flat shape of these bones provides a large surface area for muscle attachment, allowing for precise movements of the head and face. In contrast, long bones are longer than they are wide, and are found in the arms, legs, and fingers. Irregular bones have complex shapes and are found in the spine and face, while short bones are cube-shaped and are found in the wrist and ankle.
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Each carbon molecule can bond with as many as________ other atom(s) or molecule(s).
Each carbon atom has the ability to form up to four covalent bonds with other atoms or molecules. This is due to the fact that carbon has four valence electrons, which it can share with other atoms in order to form stable chemical bonds.
The number of bonds that a carbon atom can form is related to its electron configuration and the way that its electrons are arranged in orbitals. Carbon is unique in that it has four valence electrons, which allows it to form a variety of complex organic molecules and structures.
This property of carbon is central to the concept of organic chemistry, and it is what allows living organisms to form the complex and diverse range of compounds that make up their cells and tissues. The versatility of carbon in forming bonds allows it to participate in a variety of chemical reactions, including those that are essential to life.
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n the circles, show the alleles in the gametes of the parent generation. Show how the alleles recombine in the F1 plants.
The first generation of parents to cross is referred to as the parenting generation.
What is Parent generation?The offspring's genotype would be predicted based on the genotypes of the parents (F1 generation) Mendel's research on inheritance, or passing genetic traits from one generation to the next, began with the P generation.
In essence, it refers to characteristics or genes that are passed down from one generation of parents to their kids.
Parental generation is the first generation involving two individuals that are mated to foresee or analyze the genotypes of their offspring. Their probable set of offspring would constitute the so-called first filial generation (or F1 generation).
Therefore, The first generation of parents to cross is referred to as the parenting generation.
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gnificance of megaphylls?
A)They are modified leaves that have sporangia.
B)They allow plants to grow taller.
C)They increase the surface area for absorption of nutrients.
D)They increase the surface area for photosynthesis.
E)They provide a way to transport water and nutrients throughout the plant's body
Megaphylls are important because they enhance the photosynthetic surface area.
Megaphylls, on the other hand, are described as having leaves that are typically bigger in size, have intricate venation, and are connected to leaf gaps inside the stele. The telome theory proposes a hypothetical sequence of three transformations for the evolution of megaphylls from of the three-dimensional lateral roots of early vascular land plants: first, the development of determinate lateral roots (overtopping); second, the advancement of "flattened" branch systems (planation); as well as third, the emergence of. Ferns and higher developed vascular plants have megaphylls. The function of leaves in a plant's existence is distinct from photosynthesis. All pine cones, fully grown fronds and ferns, and blooms are sporophylls, or leaves that have undergone structural modification in order to bear sporangia. The leaves of gymnosperms and angiosperms, as well as the fronds of some
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