If a = (10, 4) and b= (2, 19), what is the length of ab

The length of  AB = 17

Step-by-step explanation:

AB = √[(10-2)^2 + (4-19)^2]

AB = √(64 + 225)

AB = √289

AB = 17

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.