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| Column-$I$ | Column-$II$ |
| $P$. Protonephridia / Flame cells | $I$. Prawn |
| $Q$. Nephridia | $II$. Earthworm |
| $R$. Malpighian tubules | $III$. Cockroach |
| $S$. Antennal gland / Green gland | $IV$. Platyhelminthes,Rotifers,some Annelids and Amphioxus |
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