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| Column $I$ (Excretory organs) | Column $II$ (Animals) |
| $A$. Nephridia | $p$. Hydra |
| $B$. Malpighian tubules | $q$. Leech |
| $C$. Protonephridia | $r$. Shark |
| $D$. Kidneys | $s$. Round worms,$t$. Cockroach |
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