A) Flame cells
B) Malpighian tubules
C) Kidney
D) None of the above
Correct Answer: C
Solution :
In mollusca, excretion occurs through paired sac like kidneys (or metanephridia) but in echinodermata kidneys are absent and excretion occurs partly by diffusion through body surface and partly by amoeboid coelomocytes.
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