Help asap! Correct me if am wrong! Boys and girls

Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.

If the frequency of the p allele is .63 in the population then what is the frequency of the q allele?

Which phase of the cell cycle ensures that identical copies of the dna are made for daughter cells?