Why are reptiles better adapted to life on land than amphibians?

Reptiles are cold-blooded animals (ectothermic). Their cellular metabolism generates some heat, but they do not generate enough heat to maintain a constant body temperature. Reptiles rely on the collection and loss of heat from the environment to regulate their internal temperature, for example, they move between the sun and shade.

Amphibians cannot live long on land, unlike reptiles, which mainly live on land. When amphibians are on land, their skin loses a lot of water, as they spend most of their time in water.