How many different 6 letter words can be made
a) if the 1st letter must be G, W, P or N and no letter may be repeated?
b) if repeats are allowed (but the 1st letter is G, W, P, or N
c) How many of the 6 letter words (starting with G, W, P, or N) with no repeats end with J

goog may have it for you

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.