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Life cycle of the frog:- The stages of development are the egg, the tadpole and the adult; each stage usually lasts several weeks, but can last up to two years in some species.

* tadpole :-Aquatic larva of the frog having a large head and a slender body ending in a tail; it breathes through gills.
*forelimb:-The forelimbs appear during the last stage of the tadpole’s metamorphosis.
*external gills:- Respiratory organs that filter water and take in food particles; they are later replaced by internal gills.
eggs:-Embryonic stage of the frog resulting when the egg is fertilized by the sperm.

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