| $A.$ Earthworm | $(i)$ Pioneer species |
| $B.$ Succession | $(ii)$ Detritivore |
| $C.$ Ecosystem service | $(iii)$ Natality |
| $D.$ Population growth | $(iv)$ Pollination |
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| List-$I$ | List-$II$ |
| $(a)$ Allen's Rule | $(i)$ Kangaroo rat |
| $(b)$ Physiological adaptation | $(ii)$ Desert lizard |
| $(c)$ Behavioural adaptation | $(iii)$ Marine fish at depth |
| $(d)$ Biochemical adaptation | $(iv)$ Polar seal |
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