The excretory organs found in the phylum Platyhelminthes are

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Malpighian tubules

green glands

metanephridia

protonephridia

answer is B.

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Detailed Solution

Protonephridia or flame cells are the excretory structures in Platyhelminthes (Flatworms, e.g., Planaria), rotifers, some annelids and the cephalochordate – Amphioxus. Protonephridia are primarily concerned with ionic and fluid volume regulation, i.e., osmoregulation.

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