| Column-$I$ | Column-$II$ |
| $A.$ $500$ million years ago | $1.$ Sea weeds and few plants |
| $B.$ $350$ million years ago | $2.$ Jawless fishes |
| $C.$ $320$ million years ago | $3.$ Invertebrates |
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| Column-$I$ (Organism) | Column-$II$ (Origin) |
| $P$. Invertebrates | $I$. $500$ million years ago |
| $Q$. Jawless fish | $II$. $350$ million years ago |
| $R$. Sea weeds and few plants | $III$. $320$ million years ago |
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