The document discusses the lifecycle of frogs. It begins in the water, with female frogs laying eggs protected by jelly. The eggs hatch into tadpoles that breathe with gills and grow while swimming. As the tadpole develops legs and lungs, it becomes a froglet, still with a partial tail. Finally, the tail disappears and the frog can live on land as an adult that breathes with lungs. Throughout its lifecycle, the frog transforms from an aquatic egg and tadpole to a terrestrial adult.