But still looked fish-like until Permian. Return to water to reproduce . Lives in damp places 2. Feeds on flies etc with tongue 3. Unlike reptiles, it is moist for respiration B. Locomotion 1.
Body build is fish-like.
Carrying weight on legs results in a whole new set of forces on the vertebral column. So strength now more important than flexibility. Specialized for swimming and jumping, with extensor thrusts of both hind limbs together. Gill arrangement does not work. Can vary respiratory rate across the skin, not across the lungs.