Which of the following gives an example of a set that is closed under addition?

the sum of an odd number and an odd number

the sum of a multiple of 3 and a multiple of 3

the sum of a prime number and a prime number

none of these are an example of the closure property.

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.