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| List $I$ | List $II$ |
|---|---|
| $A$. Robert May | $I$. Species-Area relationship |
| $B$. Alexander von Humboldt | $II$. Long term ecosystem experiment using outdoor plots |
| $C$. Paul Ehrlich | $III$. Global species diversity at about $7$ million |
| $D$. David Tilman | $IV$. Rivet popper hypothesis |
| Column-$I$ | Column-$II$ |
| $i$. Extinct | $a$. Decline in species population from $50\%$ to $70\%$ over last $10$ years. |
| $ii$. Endangered | $b$. Species that are abundant. |
| $iii$. Vulnerable | $c$. Species of which its last individual has died. |
| $iv$. Least concern | $d$. Decline in species population from $30\%$ to $50\%$ over last $10$ years. |
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