GUSTOIMAGES / SCIENCE PHOTO LIBRARY GUSTOIMAGES / SCIENCE PHOTO LIBRARY
Tadpoles by a water plant. Tadpoles are the immature forms of amphibians such as frogs, and undergo metamorphosis to reach their adult forms. The legs develop first, and the tail is lost after this. Tadpoles are entirely aquatic, but during maturation their gills degenerate and their lungs develop, allowing the adult frogs to live on land. Tadpoles feed on plants, but adult frogs are largely carnivorous.
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