3x + 3y + z = 1
2x – 3y + z = 2
x + y + z = 3
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by definition, an arc subtended by a central angle of some given measure has the same measure. so .

ok then what happened.

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.