Why does metamorphosis doesn't occur in human beings and viviparous animals?

Metamorphosis does not take place in humans and other viviparous animals because their offspring are fully formed inside their mother's womb. They do not need any further differentiation of their body parts. However, after their birth there is a further growth and development of the body parts to reach maturity.

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Metamorphosis does not occur in humans of viviparous animals because their young ones start resembling them in all the stages of their life beat it to be childhood ,teenage or adult where as in animals like frogrs in which metamorphosis takes place , the young ones does not resemble the young ones at all.

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