First slide
Excretory Products and Organs
Question

Protonephridia help for excretion and/or osmoregulation in how many of the following groups of animals? 

Flatworms, roundworms, insects, rotifers, urochordates, cephalochordates

Easy
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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