Random samples of sizes n1  25 and n2  20 were selected from populations A and B, respectively. From the samples, the standard deviations were computed to be s1  5.2 and s2  6.8. a. Do the data provide substantial evidence to indicate the populations have different standard deviations

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.