1. Find the value for the expression when h=13: 9 + h - 3 2.Find the value for the expression when x=6 and y= 3: x-y
3. Find the value for the expression when x=9: 3x please help

person above me is right

Step-by-step explanation:

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.