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a
Life spans of organisms are necessarily correlated with their sizes
b
Reproduction is essential for continuity of species on earth
c
The sizes of crows and parrots are not very different, so their life spans are almost similar
d
Life span of crocodile is more than the life span of tortoise
answer is B.
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Detailed Solution
Life span of organisms are not necessarily correlated with their sizes.The sizes of crows and parrots are not very different yet their life spans show a wide difference.Life span of crocodile is 60 years while that of tortoise is 100-150 years