Organisms using protonephridia for excretion are...

flatworms rotifers ,earthworm

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amphioxus,cockroach, prawn

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planaria ,cephalochordates ,rotifers

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rotifers cephalordates ,Annelids

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Solution

The correct option is A flatworms rotifers ,earthworm
A flame cell is a specialized excretory cell found in the simplest freshwater invertebrates, including flatworms(except the turbellarian order Acoela), rotifers and nemerteans; these are the simplest animals to have a dedicated excretory system. Bundles of flame cells are called protonephridia. So the correct option is 'Flatworm rotifers, earthworm’.

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