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| स्तंभ-$I$ | स्तंभ-$II$ |
| $A$. चपटा कृमि | $i$. वृक्कक (Nephridia) |
| $B$. केंचुआ | $ii$. ज्वाला कोशिकाएं |
| $C$. कॉकरोच | $iii$. मैलपीघी नलिकाएं |
| $D$. गोल कृमि | $iv$. रेनेट कोशिकाएं |
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