Pls explain... Do not give unreasonable/deconstructed answers/random letters, or a not-put-in-all-effort answer. I really need help on this.

i like ur pfp :)

Step-by-step explanation:

the answer is; biodiversity resulting from few ancestors

adaptive radiation occurs when a population is subjected to a large natural environment with spatial ecological variations. the parts of the population in the different ecologies begin to adapt to their local environments. due to non-random mating across the large populations, this causes the different populations from the large population to speciate within their local environments. they, therefore, diverge to different species sharing a common ancestor.  

the answer is

a.

x = 42

y = 10

i got it down chief.