A) annelids
B) mollusks
C) echinodermates
D) Platyhelminthes
Correct Answer: D
Solution :
[d] Solenocytes {also called flame cells) are meant for excretion and osmoregulation in platyhelminthes. Annelids have metanephridia for excretion Molluscs have kidneys (although different from vertebrate kidneys) for excretion. In echinodermates no especial excretory organs are found for excretion. In them excretion takes place through diffusion or osmosis or through active transport.
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