Nigel is planning his training schedule for a marathon for over 4-days period. he is ucertain how many miles he will run on two days. one expression for the total miles he will run is 12+y+17+z use the communitive property to write a equivalet expression

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.  

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step-by-step explanation:

i dont know the answer but here's a picture of a dog