CAN SOMEONE HELP ME WITH B AND C PLEASE? I'LL MARK AS BARAINLIEST

Since the radius of the semi circle is 10 cm then the diameter is 20 cm, when folded, its circumference is now 20, given the circumference find the radius of the cone. i guess

Volume = 1/3 πr2 (l2﹣r2)1/2

circumference = 20 cm = πD

D=6.363636364

Radius = 6.363636364/2 = 3.181818182

l = 10

vol = 100.51cm3

curved s.a = πrl

=99.96cm2

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.  

answer: 7

step-by-step explanation: