Anumber d is decreased by 5 and then doubled

(d-5)x2

Step-by-step explanation:

you said a number d is subtracted by 5 then doubled so lets make an example. d=6

(6-5)x2

(6-5)=6-5=1

(1)x2=1x2=2

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: