What changes in the external structure have appeared in reptiles in comparison with amphibians?

Changes in the external structure:
1. Leather. Reptiles have dry skin with no mucus secreting glands. It is covered with horny scales. (In amphibians, the skin is thin and naked, without scales).
2. The number of sections of the spine. Reptiles have 5 divisions. (Amphibians have 4).

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