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| $(a)$ Fourth trophic level | $(i)$ Crow |
| $(b)$ Second trophic level | $(ii)$ Vulture |
| $(c)$ First trophic level | $(iii)$ Rabbit |
| $(d)$ Third trophic level | $(iv)$ Grass |
| List-$I$ | List-$II$ |
|---|---|
| $a$. Carbon dissolved in oceans | $i$. $55$ billion tons |
| $b$. Annual fixation of carbon through photosynthesis | $ii$. $71 \%$ |
| $c$. $PAR$ captured by plants | $iii$. $4 \times 10^{13} \ kg$ |
| $d$. Productivity of oceans | $iv$. $2$ to $10 \%$ |
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