PLEASE HELP ME OUT I DONT UNDERSTAND

a.) x=12

b.) ∠A=50°

Step-by-step explanation:

See explanation on the other question. :D

Basically:

a.) All triangles' angles add up to 180°. Take all given values to set up an equation in which the sum is 180. Simplify and solve for x.

Result: x=12

b.) Insert the value of x into the given values of ∠A. Simplify.

Result: ∠A= 50°

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.