In a class of 32 students, 18 offer Chemistry, 16 offer Physics and 22 offer Mathematics. 6 offer all three subjects, 3 offer Chemistry and Physics only and 5 offer Physics only. Find the number
of students who offer
a) Chemistry only
b) only one subject
c) only two subjects​

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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.  

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