I will give 100 points to whoever can do a project on the 3 branches for me...just let me know and i will give you the details

i believe the answer is the polygon, heptagon.

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.  

m∠a is 90°

m∠b is 40°