Question

How can you say the lobefin fish were the ancestors of amphibian?

Answer 1

Amphibians are the first animals to attempt from aquatic life to terrestrial mode of life. They are the earliest tetrapods descended from fish like ancestors during the Devonian period from lobe-finned fish named sarcopterygians. Lobe-finned fishes, such as coelacanths and lungfish, were the most diverse group of bony fishes in the Devonian.

The fins evolved into the legs of the first tetrapod land vertebrates, amphibians. They also possess two dorsal fins with separate bases, as opposed to the single dorsal fin of ray-finned fish.