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B
Nephridia
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C
Malpighian tubules
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D
Renette glands
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Solution
The correct option is A Flame cells
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. Flame cells function like a kidney, removing waste materials.