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The existence of gills in a frog tadpole implies which of the following?

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Fishes evolved from frog-like ancestors

Frogs evolved from gilled ancestors

Fishes were amphibious in the past

Frogs will have gills in future

answer is B.

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Detailed Solution

Fish breathe through their gills, whereas frogs breathe through their skin and lungs. As a result, the presence of gills in tadpoles supports the theory that frogs descended from fish, and it also serves as evolutionary evidence.

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