The excretory organs of earthworms are

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green glands

kidneys

protonephridia

nephridia

answer is A.

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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. Nephridia are the tubular excretory structures of earthworms and other annelids. Antennal glands or green glands perform the excretory function in crustaceans like prawns. Kidneys are the excretory organs of vertebrates.

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