A. because if any population decrease, any other specie will decrease like a chain reaction
Since you have not posted possible answer option i shall give a common and general answer.
homestasis.
The top soil of the earth might become unusable for farming, and plants may not produce as much oxygen as they currently do
Recessive alleles can only show up when there are no dominants. If a mother has brown eyes and a father has green eyes, the offspring has a bigger chance of having brown eyes. In this case, brown eyes are dominant and green eyes are recessive. If the mother and father have green eyes, the offspring is most likely to have green eyes. In this case, green eyes are recessive.
Magnify things and enlarge and distort them
