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Q.

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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a

Three

b

Two

c

Four

d

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