Protonephridia are the excretory organs in flatworms (e.g., Planaria), rotifers and lancelets.

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Pheretima

Planaria

Pinctada

Physalia

answer is B.

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Detailed Solution

Protonephridia are the excretory organs in flatworms (e.g., Planaria), rotifers and lancelets. In Pheretima (annelid) and Pinctada (molluscan) the metanephridia aid in excretion. In Physalia, the excretion takes place by simple diffusion.

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