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| कॉलम-$I$ | कॉलम-$II$ |
| $(i)$ उत्पादक | $(P)$ प्राथमिक उपभोक्ता |
| $(ii)$ शाकाहारी | $(Q)$ शुद्ध प्राथमिक उत्पादकता |
| $(iii)$ मांसाहारी | $(R)$ प्राथमिक पोषण स्तर |
| $(iv)$ शीर्ष मांसाहारी | $(S)$ द्वितीयक उत्पादकता |
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