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a
may be too short as one day in may fly
b
includes time duration between birth and accidental death
c
usually depends upon its body size
d
is not a specific trait
answer is A.
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Detailed Solution
Life span of an organism may be too short as one day in may fly. The period from birth to the natural death of an organism represents its life span. Life spans of organisms are not necessarily correlated with their sizes. It is a specific trait of a particular species.