How can one explain the higher level of vital activity of reptiles in comparison with amphibians?

The organs and tissues of amphibians, except for the head, are supplied with mixed blood, so little energy is produced, which explains the low level of vital processes. In addition, moisture evaporates from the skin surface of amphibians, which lowers their body temperature and reduces the rate of vital processes.
In reptiles, the head and forelimbs are supplied with pure arterial blood, and the rest of the body is supplied with mixed blood, but with a higher content of arterial blood than in amphibians. In addition, reptiles use the sun’s heat to heat their bodies without fear of moisture loss, since their skin is covered with horny cover. These features of the organization of reptiles contribute to an increase in the level of vital processes.

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