EvolutionHard

Question

Presence of gills in the tadpole of frog indicates that

Options

A.fishes were amphibious in the past
B.fishes evollved from frog-like ancestors
C.frog will have gills in future
D.frog evolved from gilled ancestors

Solution

According to biogenetic law of Ernst Haeckel (1866) ontogeny repeats phylogeny. Ontogeny is the life history of an organism while phylogeny is the evolutionary history of the race of that organisma. In order words we can say an organism repeats its ancestral history during its development. Hence, resemblance of amphibian to fish is seen in most system of the body as both are cold blooded, both respire by gills (as tadpole of frog), both usually eggs in water leading to the conslusion that amphibians have orgigibated from fishes.

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