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| 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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