What is the name of the number of a fraction that indicates the number of parts in the whole?

I'm not sure I understand the question, but here's the definition of numerator and denominator:

Numerator: the number above the line in a common fraction showing how many of the parts indicated by the denominator are taken, for example, 2 in 2/3.

Denominator: the number below the line in a common fraction; a divisor; a figure representing the total population in terms of which statistical values are expressed.

Hope I helped. Please give me Brainliest!

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.