If 12 is the whole what is one-fourth

3

Step-by-step explanation: Because there are 4 fourths in one whole and 3*4=12

3

Step-by-step explanation:

Because 12 divide by 4 is three

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.