What is the surface area of a sphere that has a
diameter of 40 cm?

A = 2512 cm²

Step-by-step explanation:

The surface area of a sphere is A = 2πr².  With d = 40 cm, r = 20 cm, and so the surface area of this sphere is A = 2(3.14)(20 cm)², which works out to  A = 2512 cm²

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.  

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step-by-step explanation: