Answer:
a. It must be present in a population before natural selection can act upon the population.
Explanation:
Genetic variation is the difference in the DNA sequences in individuals, which makes a member of a species different from another member of the same species. It can also be said to be the differences in the genetic make up of individuals of a species population.
Genetic variation must be present in a species population before evolutionary mechanisms, such as evolution, can occur. Genetic variation must be present in a population of a species before natural selection can act upon the population, as natural selection can only increase or reduce the frequency of alleles present in the species population already.
Genetic variation in a population of species is important for natural selection to occur.
The true statement is that; "genetic mutation must exist before natural selection can act on it."
What is natural selection?The term natural selection refers to the fact that traits that are more favorable to enable an organism to survive and reproduce tend to persist in the population.
These traits usually occur due to genetic mutations. In a population, genetic mutation must exist before natural selection can act on it.
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What did the first cells form from? What kind of cells where
they?
Answer:
The first cells were most likely primitive prokaryotic-like cells, even more simplistic than these E. coli bacteria. The first cells were probably no more than organic compounds, such as a simplistic RNA, surrounded by a membrane.
Answer:
I agree with xXMaryaXx. I'm pretty sure she has the answer you are looking for :)
Explanation:
Beginning with the flow phase arrange biochemical process in order menstrual cycle
Answer:
1. The endometrial lining breaks down and low levels of estrogen stimulate the pituitary to release FSH and LH
2. FSH and LH stimulate the follicles to develop and the oocyte to produce estrogen.
3. Rising estrogen levels suppress FSH production and development of other follicles.
4. A spike in LH causes the follicle to rupture
5. High progesterone levels maintain the endometrial lining of the uterus.
6. A breakdown of corpus luteum causes progesterone levels to drop.
Explanation:
Answer for Plato, got it right.
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Answer:
Hi! Before I go tell me what you think of this meme I made:
Explanation:
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How does random fertilization add to the genetic variation?
Which of the following best describes a process by which metamorphic rock becomes igneous rock
A.weathering into sediments, then eroding
B.compacting under pressure and cementing
C.changing shape under heat and pressure
D.melting completely, then cooling
Which of these is NOT a reason why biodiversity is important?
a
Many species around act as a pest control.
b
There are too many animal species in the world causing competition.
c
Biodiversity loss would decrease water quality and available nutrition.
d
Biodiversity ensures food security by supplying a wide variety of plants and animal species for nutrients.
Answer:
i think the answer is d maybe
PLZZ HALP Put the following terms in order from the most specific to the broadest (1-9).....
Organelle....Organ....Macromolecule....Atom....Organism....Cell....Organ system....Molecule....Tissue
Answer:
molecule → macromolecule → organelle → cell → tissue → organ → organ system → whole organism.
Explanation:
What phrase from the selection helps you understand the meaning of “composes”?
Create a meaningful sentence using both words listed in each sentence. Nucleus, chromosome(s), Gene, trai,t Inherit, DNA
difene the meaning of the phrase entry requirements to higher education institutions and state four reasons why knowing the entry requirements is important
Answer:
1. Entry requirements to higher education are the necessary and important criteria that students intending to acquire higher education must attain before they can be granted admission.
2. Four reasons why knowing the entry requirement is important include;
a. It helps the students chose the right courses in high school.
b. It provides a standard for the universities to evaluate students objectively.
c. It ensures the admittance of students to courses suited for their capabilities and strengths.
d. It prepares students for the tasking academic environment by ensuring that they have a background knowledge of their chosen course.
Explanation:
Before students can be granted admission into schools chosen by them, they must meet certain standards to be deemed qualified by the admitting institution. Knowing these standards on time gives the students a sense of purpose and helps them to develop skills and abilities that make them qualified for admission into these schools.
It also helps the university choose the right students for different courses. Studying ahead to have the required certificates for admission helps the student gain background knowledge of their future course.
If the population runs out of food after 6 hours, what would most likely happen to the graph line between 8 and 10 hours?
It would level off.
It would decline.
It would continue to increase.
the functions of stem
Help pls
All three
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Use the Pedigree Chart to answer the following question
What does the white square represent in a Pedigree?
Answer:
A family tree
Explanation:
or a choose female or even a male
Answer:
A white square is a non-carrier/unaffected male
Explanation:
If the US modifies techniques for timber management, it is expected that US forests will
a. not be able to meet long term timber needs
Incomplete question. The full question read;
If the US modifies techniques for timber management, it is expected that US forests will
a. not be able to meet long term timber needs
b. be able to meet long term timber needs
c. result in deforestation
d. provide increasingly cheaper timber
Answer:
b. be able to meet long term timber needs
Explanation:
Remember, the emphasis here is on the modification of the present techniques for timber management in order to boost productivity.
Hence, we can conclude that since there would be an improvement in production efficiency, the US would be able to meet its long-term timber needs.
Answer:
b.
be able to meet long term timber needs
Explanation:
A student wants to study the effect of adding thermal energy to a system. Which of the following experiments should the student preform? Heat water and record it's change in temperature with time
Freeze water and record its change of temperature with time
Answer: Option 1: Heat water and record it's change in temperature with time
Explanation:
Thermal Energy = Heat
Why do the noble gases NOT form compounds readily?
Group of answer choices
They have an empty outer shell
They have a full valence shell
They have 7 valence electrons
They have no electrons
it's bc they have a full valence shell
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Answer:
Hey mate.....
Explanation:
This is ur answer.....
Nitrogen is used by plants for lots of leaf growth and good green color. Phosphorous is used by plants to help form new roots, make seeds, fruit and flowers. Potassium helps plants make strong stems and keep growing fast. It's also used to help fight disease.
Hope it helps,
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Answer:
It keeps the plants that are in it stable and healthy
Explanation:
2. What is made inside of bones that is carried throughout the circulatory system?
Answer:
oxygen, calcium or iron
Answer:
Bone Marrow
Explanation:
The inside of your bones is filled with a soft tissue called marrow. There are two types of bone marrow: red and yellow. Redbone marrow is where all new red blood cells, white blood cells, and platelets are made.
If the individuals at Level IV - 1 and 2 had offspring, what do we know
could happen?
Answer:
all their kids might have the disease
Explanation:
if you do a Punnett square for the gene Xx X for female and X Y for male, then there is a 50 percent chance their kids would have the disease
A competitive inhibitor binds ___, whereas an uncompetitive inhibitor binds ___. Please choose the correct answer from the following choices, and then select the submit answer button. Answer choices only to the enzyme; only to the enzyme-substrate complex to either the enzyme or the enzyme-substrate complex; only to the enzyme-substrate complex only to the enzyme; to either the enzyme or the enzyme-substrate complex only to the enzyme-substrate complex; only to the enzyme
Answer:
Option A, only to the enzyme; only to the enzyme-substrate complex
Explanation:
In un competitive inhibition, the inhibitor binds to an allosteric site of a enzyme which is usually present at the enzymes substrate complex.
While in competitive inhibition, an inhibitor binds to the enzyme at its active site and hence restricts the substrate from binding
Hence, option A is correct
What is the main difference between a food chain and a food web
A. There is no difference between them
B. The food chain is a part of the food web but with only one producer, primary consumer, and secondary consumers
C. The food web is a part of the diverse food chain
D. The food chain has land animals and the food web has aquatic animals
(No links)
Select the correct answer.
Which device is using a motor?
A. a water heater creates heat energy from electric energy
B.A waterfall rotates a waterwheel to turn an axel
C. A body massager uses electric energy to move back and found
B. A solar charger creates electric energy from the sun
what ways do we use patterns of classification in science? give examples
Answer:
Classification is the way scientists use to categorize and organize all of life. It can help to distinguish how similar or different living organisms are to each other
Explanation:
Patterns are used in science to classify objects or phenomena into groups. There are patterns of both similarity and difference.
What is classification?Classification is the way scientists use to group and categorize objects, phenomenon or life forms. It can help to distinguish how similar or different living organisms are to each other based upon the pattern of their structure and organization.
Patterns are regular and intelligible forms , sequences, or structure that found throughout nature. Scientific questions may be generated when scientists observe a pattern of events or when something does not match an established pattern.
For example, the frozen water in an iceberg is arranged into a regular, repeating crystal structure—a pattern of similarity. Young children can observe a common pattern of difference, the differences between adult animals and their offspring.
Thus, it is clear from above explanation, the ways to use patterns of classification in science.
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Explain the role of both biotic and abiotic factors within a nutrient cycle.
Answer:
Answer. Biotic factors are the living things in an ecosystem so they do not recycle. Abiotic factors are the different physical and chemical components available like temperature, air, water, minerals, rocks,and PH. Not ll of them are recycled.
The role of both factors within a nutrient cycle is very important because nutrients cycling through biotic and abiotic systems constantly.
Explain the role of both biotic and abiotic factors within a nutrient cycle?Plants, animals, microorganism and organic matter are the biotic locations of nutrients while on the other hand, the atmosphere, water, and soil represent the abiotic locations. Nutrients are constantly moving or cycling through biotic and abiotic systems.
So we can conclude that the role of both factors within a nutrient cycle is very important because nutrients cycling through biotic and abiotic systems constantly.
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Which of the following stars is likely to be the dimmest? The hottest star The least massive star The star that is blue in color The star with the fastest fusion rate
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Explanation: btw its B the least massive star
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The brain sends signals to the rest of the body so that our bodies do what is needed to survive. Explain what the brain tells your body to do if you touch a hot object with your hand.
A) Move your hand away
B) Pump less blood to your hand
C) Slow down your heart rate
Answer:
A
Explanation: I got it correct on a quiz I did that had this question
Move your hand away. Therefore, option (C) is correct.
What is reflex arc?A reflex arc is a neural pathway that mediates a reflex action. It is a rapid and automatic response to a specific stimulus that does not require conscious thought or decision-making from the brain. When a sensory receptor in the body, such as the skin or muscles, is stimulated, a nerve impulse is transmitted to the spinal cord, where it is processed by an interneuron.
The interneuron then sends a signal through a motor neuron to the effector, such as a muscle, causing a rapid and involuntary response, such as pulling your hand away from a hot stove. This entire process occurs without conscious control from the brain, allowing for quick and protective responses to potentially harmful stimuli.
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Describe the flow of energy to the lion using a food chain from the food web that includes a rabbit.
Answer:
10%
Explanation:
the sun gives energy to the grass (to make it easier to understand, say the sun gives 100un of energy to the plants)
from there, the rabbit eats the grass( 10% of 100 is 10, so the rabbit gets 10un of energy)
and the, a lion eats the rabbit (10% of 10 is 1, so the lion gets 1 un of energy)
every single time a predator consumes prey, it only gets 10% of what the prey gets from its prey.
Hope this helps :)
A short true-breeding plant will always produce a short plant.
True or false
Answer: false
Explanation:
How does specialization impact agriculture?
Answer:
In agriculture specialization, farmers produce one crop instead of so many crops. In other words, the farmers, adopt specialized farming. By doing so they avail all those benefits which are accrued to the big businesses. Hence the goods are produced on a large scale.