NEET BIOLOGY

Detailed explanation-1: -Even in vertebrates, metamorphosis is frequent [5]: in addition to amphibians, most teleost fish, representing half of all vertebrate species, undergo metamorphosis (Figure 1). This post-embryonic transition also occurs in basal vertebrates, such as lampreys.

Detailed explanation-2: -The larvae of most amphibians have gills and look like fish when they are born. They go through metamorphosis and grow four legs and develop air-breathing lungs when they become adults. Toads, frogs, salamanders, and newts are all amphibians.

Detailed explanation-3: -Metamorphosis is actually widespread in the vertebrates, though quite diverse in the way it manifests in a particular species.

Detailed explanation-4: -In mammals, moving through adolescence is not a metamorphosis as the development is gradual and the adult organism resembles its juvenile form. This is why there are no mammals which go through metamorphosis. Birds cannot metamorphose either, but insects, amphibians and fish.

Detailed explanation-5: -Most amphibians have four stages of metamorphosis, but not all. Some frogs lay their eggs on land and eggs hatch into froglets instead of tadpoles. These froglets live on land. Some species of salamanders skip most of the metamorphosis; these species hatch from their eggs as tiny versions of the adult.