Presence of gills in the tadpole of frog indicates that (a) fish were amphibious in the past (b) fish evolved from froglike ancestors (c) frogs will have gills in future (d) frogs evolved from gilled ancestors. (2004)
Option D It is universally accepted that amphibians (frogs) have originated from fishes. Resemblance of amphibia to fish is seen in most systems of the body. Both are cold blooded. Fish respire by gills and also tadpole of frog respires by gills. To prevent dessication in air, both usually lay eggs in water.
