Sam has 4 pencils for every 2 erasers.

4/2 or 2/1?

is that the kind of answer you need?

If it's not I'll give a different answer in the comments

.19875994384

step-by-step explanation:

1699/ 8548

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.