A) fishes were amphibious in the past
B) fishes evolved from frog-like ancestors
C) frogs will have gills in future
D) frogs evolved from gilled ancestors
Correct Answer: D
Solution :
Presence of gills in the tadpole of frog indicates that frog evolved from gilled ancestors. According to Ernst Haeckel theory of Biogeneric, "ontogeny (development of embryo) is recapitulation of phytogeny" (the ancestral sequence).
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