Excretory organs of Amphioxus are

Nephridia

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Pronephric kidney (protonephridia)

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Mesonephric kidney

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Metanphridic kidney

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Solution

The correct option is C Pronephric kidney (protonephridia)
Excretory organs of Amphioxus is the pronephros. The pronephros is the anterior end of this excretory organ, which is developed before the rest to meet the larval needs.
So, the correct answer is option B.

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