In most species,the female frog lays her eggs directly in the water as a male clasps her back and releases sperm.The fertilized eggs hatch into legless,aquatic tadpoles.Most tadpoles feed on algae,and have gills.As they mature,tadpoles develop legs and lungs,lose the tail,and acquire carnivorous tastes.The primary function of external gills in aquatic animals is to:

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External gills in aquatic animals serve the primary function of exchanging gases with the water. This is crucial for tadpoles as they get oxygen through their gills from the surrounding water until they develop lungs.

In Most Species,the Female Frog Lays Her Eggs Directly in the Water