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Presence of gills in the tadpole of frog indicates that

1. fishes were amphibious in the past
2. fishes evolved from frog-like ancestors
3. frogs will have gills in future
4. frogs evolved from gilled ancestors

Correct answer: frogs evolved from gilled ancestors

Solution

Tadpoles have gills because they retain an ancestral vertebrate feature during development. This suggests frogs descended from ancestors that already had gills, rather than implying fish came from frogs or that frogs will gain gills later.

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