Protonephridia help for excretion and/or osmoregulation in how many of the following groups of animals?
Flatworms, roundworms, insects, rotifers, urochordates, cephalochordates

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Three

Two

Four

Five

answer is B.

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Detailed Solution

Protonephridia, or flame cells are the excretory structures in Platyhelminthes (e.g., Planaria), rotifers, some annelids and the cephalochordate (e.g., Amphioxus).

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