The excretory structure of Amphioxus (cephalochordate) is:

Green gland

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Nephridia

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Flame cell

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Malpighian tubules

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Solution

The correct option is C Flame cell
Protonephridia or flame cells are the excretory structures in Platyhelminthes (Flatworms, e.g., Planaria), rotifers, some annelids, and the cephalochordate – Amphioxus.
Green glands perform the excretory function in crustaceans like prawns.

Malpighian tubules are the excretory structures of most of the insects.

Nephridia are the tubular excretory structures of earthworms and other annelids.

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