What is the difference between metamorphosis and retrogressive metamorphosis?

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Metamorphosis:
In biology, a term, which illustrates a transition in structure, shape, or function is metamorphosis.
Retrogressive metamorphosis:
A form of metamorphosis in which a free-swimming, aquatic larva exhibiting notochord converts into a non-chordate and sessile adult is termed retrogressive metamorphosis.
Metamorphosis
Retrogressive metamorphosis
1. In this a variation in shape is usually associated with a shift in habitat or behavior. 1. It involves the complete loss of advanced features, which prevailed at the time of the larval stage.
2. The insects and amphibians go through a metamorphosis as a part of their life cycle. 2. Some of the urochordates via neoteny do not display any changes related to metamorphosis in their larva. As a consequence, sexual reproduction by mature larval form takes place.

Metamorphosis	Retrogressive metamorphosis
1. In this a variation in shape is usually associated with a shift in habitat or behavior.	1. It involves the complete loss of advanced features, which prevailed at the time of the larval stage.
2. The insects and amphibians go through a metamorphosis as a part of their life cycle.	2. Some of the urochordates via neoteny do not display any changes related to metamorphosis in their larva. As a consequence, sexual reproduction by mature larval form takes place.

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