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| Column-$I$ | Column-$II$ |
|---|---|
| $(i)$ Viroid | $(a)$ Ramachandran |
| $(ii)$ Cell | $(b)$ Leeuwenhoek |
| $(iii)$ Virus | $(c)$ $T.O. Diener$ |
| $(iv)$ Triple helical structure of collagen | $(d)$ Ivanowsky |
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