It's often impossible to repeat trials on the same subjects. 2-Subjects may report an inaccurate medical history. 3-It can be difficult to control all possible variables. 4-It's impossible to come up with testable scientific questions for human subjects.
Answer:
It’s often impossible to repeat trials on the same subjects.
Subjects may report an inaccurate medical history.
It can be difficult to control all possible variables.
There are ethical or privacy concerns to consider.
7. The living part of earth where life exist *
geosphere
hydrosphere
nitrosphere
biosphere
Answer:
biosphere
Explanation:
The biosphere is made up of the parts of the earth where life exists.
The biosphere extends from the deepest root systems of trees to the dark environment of ocean trenches,to lush rain forests and high mountain tops..
DNA is composed of peating structural units
called
is the five-carbon sugar found in
DNA.
DONE
Answer:
Explanation:
if u mean repeating structural units of the DNA they are nucelotides or nucleotide bases.
and Yes, there is a five-carbon sugar in the DNA. It's called deoxyribose.
Why do siblings look like their parents but not exactly like them and also
look like each other but not exactly alike? *
A) Siblings receive the same genes from their parents but those are turned on and off in
different ways.
B) Siblings receive the genes from their parents but some become dominant or recessive
differently in each kid.
C) Siblings receive genes from their parents but the combinations are always scrambled
through meiosis.
Answer:
B
Explanation: Seems like the most relevant answer.
Help please
Mangrove trees can only survive in moderately saline water. What are such organisms called?
A. Euryhaline
B. Stenohaline
C. Mesohaline
D. Polyhaline
E. Oligohaline
Answer:
I believe the answer is Euryhaline
A group of students used classroom materials to build a model of cellular structures which statement
describes the best way materials were used to model mitochondria?
А
a beaker with water, to model how the cell gets its shape
B
a battery with wires, to model energy for cellular processes
С
a cloth bag, to model how the cell let's materials into and out of it
D
a computer mouse, to model how the cell controls cellular processes
larva stage of insect miving in mass is called
the muscular tube that connects the mouth cavity to the stomach
Answer:
Answer:
Esophagus
I hope I have helped you babes ❤️
The carrying capacity for a population of frogs in a rainforest ecosystem is 840 frogs, and the maximum rate of increase for this population is 1.0 per individual per year. Using the logistic population growth model, what is the approximate population growth rate for 212 frogs?
4 frogs per year
29 frogs per year
158 frogs per year
314 frogs per year
Answer:
4 frogs per year is the answer
In logistic growth, a population's per capita growth rate gets smaller and smaller as population size approaches a maximum imposed by limited resources in the environment, known as the carrying capacity (K).
Formula used: dN/dT= rN{1-N/K}
Given: k= 840 frogs
N= 212, r= 1 year
To find: r=?
Solution:
putting value in equation:
dN/dT= rN{1-N/K}
dN/dT = 1 x 212 {1-212/840}
so, dN/dT= 158.57 ( approx)
Final answer: The correct option is (c)
158 frogs per year
Thus, we can conclude that 158 frogs per year will be the population of frogs.
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Hormones are chemical molecules produced by glands. Vasopressin is a hormone secreted by the cells of the hypothalamus, a part of the brain. The hormone regulates homeostasis through its effect on the kidney cells. Which statement is true based on this information?
Answer:
Hormones are chemical molecules produced by glands is true
Answer:
Hormones are chemical molecules produced by glands.
Explanation:
TRUE
In the early days of the solar system, many planetesimals orbited the Sun. The theory has it that one large planetesimal the size of Mars struck a glancing blow to the molten Earth. How did this event contribute to the formation of the Moon?
Answer:
This event led to the breaking away of a part of earth and the part was held on by earth’s gravity and this part became the moon.
Explanation:
The formation of moon was after the formation of the earth. In the initial years of the formation of earth it was affected by several asteroid hits and comets. Small planets referred to as planetesimals also kept continuously affecting the earth. Before 4.5 billion years ago a planetesimal which was about the size of Mars hit earth.
This hit led to the breaking away of a part of earth. The part which was sent to space by the hit was caught by the gravity of the earth and the part started orbiting around the earth. The similarity of the rocks in moon to that of earth is attributed to the fact that moon was actually formed from earth.
The moon and earth keeps influencing each other. The moon’s effect reduced the speed of earth’s rotation and the moon keeps moving away from the earth due to the influence of earth.
Answer:Molten rock broke off from Earth following the impact. The rock coalesced (gathered) into a ball, which formed the Moon.
Explanation: Edmentum
Which of the following areas of study is pursued by pomologists?
study of plant colors
study of fruits and nuts
study of grape cultivation
study of floral design
Which of the following best describes bear hibernation?
a. It causes hormonal imbalance and cellular communication failure.
b. It is a disruption between circadian rhythms and environmental cues.
c. It is a physiological condition resulting from north-south and south-north travel.
d. It is a psychological phenomenon that affects people traveling between time zones.
Answer:
the answer is C
Explanation:
Explain the difference between exponential growth models and logistic growth models and insert a picture of each model.
Answer:
When the per capita rate of increase ( r) takes the same positive value regardless of the population size, then we get exponential growth. When the per capita rate of increase ( r) decreases as the population increases towards a maximum limit, then we get logistic growth.
Explanation:
Exponential population growth: When resources are unlimited, populations exhibit exponential growth, resulting in a J-shaped curve. When resources are limited, populations exhibit logistic growth. In logistic growth, population expansion decreases as resources become scarce.
When 2 or more organisms compete for the same resource there can be a variety of outcomes. What would be one of those outcomes?
Answer:
The biology branch deals with the relations between and physical environment of organisms.
Explanation:
The principle of competitive exclusion states that if two species occupy the same niche, they cannot exist together (competing for identical resources). Two species whose niche overlap can evolve to have different niches through natural selection, resulting in the distribution of resources.
In ecology, interspecific competition is a form of competition where individuals from different kinds compete in an ecosystem for the same resources (e.g. food or space)... There may be interspecific competition if people of two separate species share a limited resource within a single area.
3 times the sum of 2 and y?"
Answer and Explanation:
3(2 + y) is the answer.
The 3 is multiplying the 2 and y inside the parenthesis.
#teamtrees #PAW (Plant and Water)
Sequence the steps in the chain of infection in the correct order. identify influenza, new patient comes in contact with sick patient, influenza struck (sick) patient, sick patient sneezes, new patient is infected, new patient inhales through the nose
Answer:
influenza struck (sick) patient
new patient comes into contact with sick patient.
sick patient sneezes
new patient inhales through nose
new patient is infected
Explanation:
Answer: influenza struck (sick) patient
new patient comes into contact with sick patient.
sick patient sneezes
new patient inhales through nose
new patient is infected
ou have isolated a previously unstudied protein, identified its complete structure in detail, and determined that it catalyzes the breakdown of a large substrate. You notice it has two binding sites. One of these is large, apparently the bonding site for the large substrate; the other is small, possibly a binding site for a regulatory molecule. What do these findings tell you about the mechanism of this protein
Answer:
These findings tell us that possibly this protein has an enzymatic function, that is, it is an enzyme.
Its function can be catalytic as well as analytical.
The substrate binding site should be the largest, while the other regulatory site is the smallest.
Explanation:
This happens since hormones regulate their enzymatic activity through inhibitory sites.
They have another smaller binding site, where when an inhibitory molecule binds, it deforms the morphology of the protein causing it to no longer bind to its substrate at the binding site, therefore they inhibit the chemical reaction that is happening within the enzyme. both catalytic and analytical.
What are the four
characteristics that identify something as living?
Properties of Life. All living organisms share several key characteristics or functions: order, sensitivity or response to the environment, reproduction, growth and development, regulation, homeostasis, and energy processing. When viewed together, these characteristics serve to define life.
What does a two direction arrow indicate in a chemical equation
Answer:
reversible reaction
Explanation:
The double arrow denotes a reversible reaction. The reactants become products and the products can become reactants again using the same process.
What is the structure of a Triglyceride?
A. A glycerol head with 3 fatty acid tails
B. 3 Glycogen heads connected to a Hydroxyl tail
C. 3 Hydroxyls connected to a glyceride
D. A glycerol head with 2 fatty acid tails
Answer:
A. A glycerol head with 3 fatty acid tails
Explanation:
One glycerol attached to 3 fatty acids each
The structure of a Triglyceride is a glycerol head with 3 fatty acid tails. Hence the correct option is A.
The structure of a triglyceride consists of a glycerol molecule bonded to three fatty acid tails. Glycerol is a three-carbon alcohol with a hydroxyl group attached to each carbon, while fatty acids are long hydrocarbon chains with a carboxyl group at one end. Through a condensation reaction, the hydroxyl group of each glycerol molecule combines with the carboxyl group of a fatty acid, resulting in the formation of an ester bond.
This process is repeated three times, with each fatty acid binding to a different carbon of the glycerol molecule, thus forming a triglyceride. The three fatty acid tails provide energy storage and insulation properties, while the glycerol molecule serves as a backbone for their attachment. Triglycerides are the main storage form of fat in animals and plants.
Hence the correct option is A.
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Students are each given a 20-gram sample of an unknown solid compound in a clear plastic bag. They are instructed to break the material into smaller parts by gently hitting it with a hammer. Some of the parts break into large chunks and some look like a fine powder.
Which statement correctly describes these broken pieces of the sample?
The fine powder pieces are individual atoms broken from the solid.
The larger pieces are still compounds and the smaller pieces are elements.
Each piece contains the same number of atoms.
Each piece contains the same proportion of different elements.
Answer:
D - Each piece contains the same proportion of different elements
Explanation:
just took the quiz on edge 2021
D, I did the test just now and got 100% :)
Despite the diversity of nature, most organisms contain the same 4 DNA bases.
What are those bases? *
Adenine, thymine, cytosine, uracil
Adenine, thymine, cytosine, guanine
Adenine, thymine, cytosine, lysine
Adenine, uracil, cytosine, valine
Answer:
Adenine, thymine, cytosine, guanine
Explanation:
some things use uracil instead of guanine but its less common. also to remember which ones pair up, remember Apple in the Tree (Adenine pairs with Thymine), and Car in the Garage (Cytosine pairs with Guanine).
What makes up the "head" region of a phospholipid? __________Is it hydrophobic or hydrophilic?_________
Answer:
Phospholipids consist of a glycerol molecule, two fatty acids, and a phosphate group that is modified by an alcohol. The phosphate group is the negatively-charged polar head, which is hydrophilic. The fatty acid chains are the uncharged, nonpolar tails, which are hydrophobic.
PLEASE HELP ME PLEASE HELP ME PLEASE HELP ME PLEASE HELP ME PLEASE HELP ME PLEASE HELP ME PLEASE HELP ME PLEASE HELP ME PLEASE HELP ME PLEASE HELP ME PLEASE
Answer:
1)F
2)F
3)R
4)F
5)F
6)No change
7)R
8)No change
9)R ?
10) No change
How many inherited traits are considered in a dihybrid cross?
a.)2
b. )1
c.)3
d.)4
When the stimulus voltage is increased, _______. When the stimulus voltage is increased, _______. sodium permeability into the cell decreases sodium permeability into the cell increases to overcome the potassium exiting a greater-than-threshold depolarization results a greater-than-threshold depolarization results and sodium permeability into the cell increases to overcome the potassium exiting.
Answer:
a greater-than-threshold depolarization results and sodium permeability into the cell increases to overcome the potassium exiting.
Explanation:
The occurrence of action potential requires the existence of active voltage-dependent channels to open and close in response to the membrane depolarization.
When depolarization reaches and supers the threshold point, voltage-dependent Na+ channels open and the ion gets into the cell. The entrance of Na+ decreases the electric charge difference between the cellular interior and exterior. Membrane depolarizes and produces the action potential that tends to reach a potential equilibrium for Na+ = +60mV. The higher the Na+ input is, the greater is the depolarization and the greater is the Na+ permeability.
Once Na+ channels are closed, voltage-dependent K+ channels open, increasing the membrane permeability to the ion, letting K+ get out of the cell, following the electrochemical gradient.
The closure of Na+ channels and opening of K+ channels are responsible for membrane repolarization.
do invertebrates have limbs for locomotion?
Terrestrial locomotion has evolved as animals adapted from aquatic to terrestrial environments. Locomotion on land raises different problems than that in water, with reduced friction being replaced by the increased effects of gravity.
hope it helps...
Answer:
Explanation:
Are insects glued to one spot? Think of the mosquito which can land on anything with blood and get what they need. They can also walk around to look for a nice juicy conduit.
Spiders -- same story. They spin their webs and wait to see what hits the webs.
What about the octopus, which has 8 legs to propel him. Almost all insects have ways of moving around.
Which factor affects the amount of runoff that occurs in an area?
Answer:
Vegetative cover and type of soil.
Explanation:
Vegetative cover and type of soil are the factors that affects the amount of runoff that occurs in an area. Vegetative cover reduce the amount of runoff because it makes the soil porous which absorb more amount of water inside the soil while on the other hand, type of soil also affects the runoff such as sandy soil absorb most of the runoff water and sometimes no water is available for runoff.
Answer:
d
Explanation:
Where are sperm produced?
A. Vas deferens
B. Testes
C. Ejaculatory duct
D. Epididymis
Answer:
Option B
testes not copied
The main function of this process is to
Answer:
what process? is there more to the question
Explanation: