The time required to complete a job varies inversely as the number of people working. it took 4 hours for 7 electricians to wire a building. how long would it have taken 3 electricians to have done the job?

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.