| List-$I$ | List-$II$ |
|---|---|
| $A$. About $65 \text{ mya}$ | $I$. Jawless fish probably evolved |
| $B$. About $500 \text{ mya}$ | $II$. The dinosaurs suddenly disappeared from the earth |
| $C$. About $350 \text{ mya}$ | $III$. Seaweeds and few plants probably existed |
| $D$. About $320 \text{ mya}$ | $IV$. Invertebrates were formed and became active |
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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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