If< br />
the revenue for the week is $2000, and labor cost consists of two < br />
workers earning $8 per hour who work 40 hours each, what is labor cost < br />
as a percentage of revenue? < br />

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.