PLEASE HELP Find the values of c that would make the following a "perfect square trinomial"
25x^2 + 5xcy + 64y^2

answer: there are 453.592 grams in a pound.

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.