What number is missing here?
2, 3, 5, 8, 13. ?

so the answer must be 21, right? this will be 21, in this sequence every next digit is the sum of previous two digits as5=3+2 ,next 8=5+3 then 13= 5+8 hence the next will be 8+13=21 . 21

^•^

2, 3, 5, 8, 13 missing number is 18.

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.