quadrilateral abcd is inscribed in this circle.

what is the measure of angle c?

enter your answer in the box.

my answer is$ 12

step-by-step explanation:

because 15 -2=12

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.