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igor_vitrenko [27]
3 years ago
15

Which best describes how long it usually takes for speciation to occur? several generations one generation several years several

days
Biology
1 answer:
melamori03 [73]3 years ago
3 0

Answer:

Several generations

Explanation:

For a completely new species to branch out of its predecessor, a series of germline mutations are needed. Each mutation is spontaneous , random, directionless and depends on individual and environmental factors. Only favourable mutations (purely on luck) pave the way to speciation.

Thus, speciation is not a single generation phenomenon. It takes several generations to fully manifest. The phenomenon of mutation being a random event makes speciation an ever longer procedure.

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Which best describes the age structure of a population with zero population growth?
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Answer:

The correct option is D) The age-structure diagram would be column-shaped with all age classes approximately equal.

Explanation:

A zero population growth refers to a condition when the birth rate equals to the death rate. Social workers tends to find methods to attain zero population growth as such conditions provide economic stability. As the birth rate and the death rate will be equal hence the age structure diagram of such a population can be seen to be column shaped as they all will be equal.

5 0
3 years ago
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iruses, not bacteria, cause cold and flu. However, some people demand antibiotics from their doctors to help control the symptom
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Answer:

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8 0
3 years ago
Why are pigments such as chlorophyll needed for photosynthesis
Vlad [161]

Answer:

The chlorophyll pigment have photosystem 680/ PS I which captures the sunlight. Then the pigments gets excited and photosynthesis starts. Without chlorophyll photosynthesis can't happen.

Explanation:

Photosynthesis occurs in the chlorophyll pigment of the plant. They have the capacity to trap light energy and convert its energy to form glucose and oxygen.  

The chlorophyll is a double layer membrane structure. In it two photosystems works i.e. photosystem I and photosystem II. In the photosystem I light is trapped.  

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The photon have more energy, and when it comes in contact with PS 680, the pigments get excited. Then they release high energy electrons which helps to form ATP, NADPH. Because it is a light dependent reaction.

Glucose and oxygen are formed in the stroma as it does not require light. It is a light independent reaction.

Therefore, chlorophyll is first require to capture photons coming from sun.

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Decomposers are living organisms that breaks down other living and non-living things into smaller parts.

Decomposers can recycle dead plants and animals into chemical nutrients such as carbon and nitrogen that are released back into the soil, air and water as food for living plants and animals.
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