| $A.$ 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-$II$ |
| $A$. Logistic growth | $I$. Unlimited resource availability condition |
| $B$. Exponential growth | $II$. Limited resource availability condition |
| $C$. Expanding age pyramid | $III$. The percent individuals of pre-reproductive age is largest followed by reproductive and post-reproductive age groups |
| $D$. Stable age pyramid | $IV$. The percent individuals of pre-reproductive and reproductive age group are same |
| $A$. Natality | $I$. $\frac{dN}{dt} = rN$ |
| $B$. Exponential growth | $II$. Death rate |
| $C$. Mortality | $III$. Birth rate |
| $D$. Logistic growth | $IV$. $\frac{dN}{dt} = rN \left[1 - \frac{N}{K}\right]$ |
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