Help&EXPLAIN
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r=15/4 or 3.75

Step-by-step explanation:

r= C/(2π)

r= 23.55/ (2 x 3.14)

r= 15/4

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.