First slide
Classification of Animals
Question

The animal group, where the adults are degenerated but larvae are well developed, is 

Moderate
Solution

'Retrogressive metamorphosis' means degenerative changes wherein an active larva transforms into a sedentary adult. For example, in Urochordata, the larva bears all advanced characters of Chordata but after metamorphosis, the loses its chordate characters (like tail and notochord).

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