Answer :
Evolutionary adaptations for survival on land produced tetrapods, which later evolved into amphibians, reptiles, and mammals.
Evolution: It can be defined as a natural phenomenon that involves the modifications in physical, biological, and metabolic characteristics of any species which get inherited from one generation to another resulting in better, more advanced new forms of species. This is a very slow process that usually took millions of years to establish a new species from a preexisting one.
The evolution of tetrapods started in the devonian period at around 400 million years ago which are kept under superclass tetrapoda which includes amphibians, reptiles, bird and mammales. The body plan, breathing plan, navigating plan all evolved with time and the tetrapods gets cherecterised into amphibians, reptiles, and mammals.
These facts were estabilished by the transitional fossils collected in late 20th century which are tested and studied on the basis of modern phylogenetic analysis.
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