Cecilia's mom ordered pizza for dinner. The pizza has two slices of pepperoni, two slices of mushroom, and two slices of anchovy. Cecilia asks her brother to bring her two slices. List all the possible combinations where the first choice is pepperoni.

If the first slice is pepperoni, then we have left:

1 slice of pepperoni.

2 slices of mushrooms.

2 slices of anchovy.

Then the possible combinations are:

Pepperoni and pepperoni (in only one combination)

Pepperoni and mushrooms (in two combinations, because there are two slices left)

Pepperoni and anchovy (Again in two combinations, because there are two slices left)

These are the 3 possible combinations, 5 in total.

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.