| Column-$I$ | Column-$II$ |
| $P$. Origin of Earth | $I$. $4500 \, mya$ |
| $Q$. Origin of Life | $II$. $4000 \, mya$ |
| $R$. Origin of first cellular life | $III$. $3000 \, mya$ |
| $S$. Origin of first non-cellular life | $IV$. $2000 \, mya$ |
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