The diversification of reptiles facilitated by the evolution of the reptilian egg is a good example of adaptive radiation.
A rapid growth in the number of species sharing a common ancestor that is characterized by high ecological and morphological variation is known as adaptive radiation. It is fueled by organisms' ability to adapt to novel ecological situations.
The formation of their scaly skin, which contains the protein keratin and waxy lipids, limiting water loss from the skin, was one of the major adaptations that allowed reptiles to live on land. Because of this occlusive skin, reptiles and amphibians both use their lungs to breathe rather than their skin for respiration. The phenomenon of adaptive radiation was first observed by Darwin. During the Mesozoic era, the age of reptiles ( dinosaurs), mammals were small, generalized, and rare.
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