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A young frog. It lives in water and breathes through gills. A tadpole has a tail to help it swim. As it becomes an adult frog, it grows legs.
The series of changes some animals go through as they develop from eggs to adults
Water animals, like fish and tadpoles, use gills to breathe underwater.
Frogs have webbed feet. Skin connects their toes. This helps them swim better.
Organs inside your chest that help you breathe air. Animals that live on land have lungs, as do some that live in water, like whales.