The frog is an amphibian. Her large-cell lungs provide only 50% of the oxygen necessary for life, the remaining 50% it receives through the skin. Skin respiration requires it to be moist, so there are many skin glands that secrete mucus.
The lizard is a reptile. Her lungs have a fine-mesh structure and fully provide the body with oxygen. Therefore, the lizard’s skin is dry, but so that moisture does not evaporate through the skin, it is covered with horny scales.
The structure is related to the level of organization and habitat.
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