Question

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Environmental factors can influence natural selection because they can increase or decrease
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the number of chromosomes in an individual.
the number of chromosomes in a population.
the amount of genetic variation in an individual.
the amount of genetic variation in a population.

Answer 1

Answer is the amount of genetic variation in a population Natural selection gets impacted by environmental factors.

Step-by-step explanation:

Answer 2

D

Step-by-step explanation:

A and B are wrong because environmental impacts can't change the amount of chromosomes an animal has. D is a better answer than c because genetic variation happens within a population rather than an individual.