HardZoologyExcretory Products & Their Elimination
+4 / -1
Protonephridia or flame cells are the excretory organ of:
A
Flatworms only
B
Flatworms and Roundworms
C
Flatworms, rotifers, some annelids & cephalochordate
D
Flatworms, roundworms, annelids & urochordates
Explanation
Protonephridia (flame cells) are primitive excretory structures found in Platyhelminthes (Flatworms), rotifers, some annelids, and cephalochordates like Amphioxus.
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