Which one of the following organelle occurs in molluscs but not in Echinoderms?

Flame cells

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Malpighian tubules

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Kidney

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None of the above

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Solution

The correct option is D Kidney
C. Kidney
EXPLANATION: Molluscs have a well developed excretory system. Tubular nephridia organised as the kidney in molluscs. In echionoderms there is no kidney, because the excretory system is not well developed.

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