EVERYDAY SCIENCE

Detailed explanation-1: -Amphibians evolved about 365 million years ago from a lobe-finned fish ancestor. As the earliest land vertebrates, amphibians were highly successful for more than 10 0 million years until reptiles took over as the dominant land vertebrates.

Detailed explanation-2: -The earliest amphibians evolved in the Devonian period from sarcopterygian fish with lungs and bony-limbed fins, features that were helpful in adapting to dry land. They diversified and became dominant during the Carboniferous and Permian periods, but were later displaced by reptiles and other vertebrates.

Detailed explanation-3: -Evolution of Amphibians: Gradually, their fins evolved into pairs of limbs, and these fish species became ancestors to all the tetrapods, including the amphibians, birds, reptiles, mammals, etc.

Detailed explanation-4: -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.

Detailed explanation-5: -All of the early amphibians had four strong limbs, which developed from the fins of their fish ancestors. Lobe-finned fishes were ancestors of the first amphibians that spend a significant part of their life on land. Lobe-finned fishes had numerous preadaptations that allowed them to transition to life on land.