Presence of $NaCl$ in body fluid indicates that life originated in
Primitive ocean
Rain water lakes
Salt solution
All of these
Oceans have large content of $NaCl$.
A scientist kept 72 generations of Drosophila in darkness. Even after that the first flies had normal eyes. This disapproves the theory of
The greatest evolutionary change enabling the land vertebrates to be completely free from water, was the development of
Forelimbs of cat, lizard used in walking; forelimbs of whale used in swimming and forelimbs of bats used in flying are an example of
$A$ : Sometimes, some babies have a small tail. $R$ : This is just a type of mutant variety
A species that contains two or more sub-species are called
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