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| कॉलम $I$ (उत्सर्जी अंग) | कॉलम $II$ (जंतु) |
| $A$. नेफ्रिडिया | $p$. हाइड्रा |
| $B$. मैलपीघी नलिकाएं | $q$. जोंक |
| $C$. प्रोटोनेफ्रिडिया | $r$. शार्क |
| $D$. वृक्क (Kidneys) | $s$. गोल कृमि,$t$. कॉकरोच |
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