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Life History Of Frog

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08048036175

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Hyderabad, India, 500001

Description

The life history of a frog is an example of metamorphosis and involves four main stages: egg, tadpole, froglet, and adult frog. Frogs undergo dramatic changes in shape and function as they transition from eggs in water to land-dwelling adults.​ Stages of Life History Egg Stage: Adult female frogs lay hundreds of jelly-like eggs, grouped together as frogspawn in water—typically ponds or other calm aquatic environments. These eggs are protected by a gelatinous coat and hatch in about one to three weeks, depending on species and environmental conditions.​ Tadpole (Larva) Stage: Upon hatching, tadpoles emerge with gills, a tail, and no legs, living entirely in water. They feed mostly on plant material and continue to grow, gradually developing their hind legs first, then front legs, while lungs begin to form for later breathing on land.​ Froglet Stage: As development progresses, tadpoles lose their gills and tails shrink, becoming froglets—small versions of the adult frog but still bearing a short tail stub. At this point, their lungs are functional, allowing them to start life on land, although they may still stay near water.​ Adult Frog: The young frog's tail and gills disappear completely with the final transformation. Now a fully formed adult, it breathes with lungs and skin, moves efficiently on land, and primarily eats insects or small animals. Adult frogs return to water bodies to reproduce, beginning the cycle anew.​ Key Adaptations and Features The frog's life cycle demonstrates adaptation to aquatic and terrestrial environments, with gills for underwater life and lungs/skin respiration for land. Metamorphosis is controlled by hormones (notably thyroxine), enabling radical transformation of body structures for survival at each stage.​ Frogs exhibit parental behaviors such as laying eggs in vegetation to enhance survival, though most leave eggs to develop independently.​ This metamorphic lifecycle is not only crucial to the frog's survival but also serves as a classic biological model of amphibian development.​

Model No. N-EM075

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