The expression (x-6)^2

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.  

my answer got deleted but it's a

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answer: i literally just answered this question but they want me to do it again

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if i put something wrong your not gonna like it so rather not say nothing.