A) protonephridia
B) flame cells
C) solenocytes
D) All of the above
Correct Answer: D
Solution :
Platyhelminthes (.e.g., Planaria, liver fluke and tapeworm) possess the simplest tubular excretory system called protonephridia, flame cells or solenocytis. Excretory material is ammonia in aquatic flatworms.
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