| List $I$ | List $II$ |
| $A$. Mesozoic Era | $I$. Lower invertebrates |
| $B$. Proterozoic Era | $II$. Fish and Amphibia |
| $C$. Cenozoic Era | $III$. Birds and Reptiles |
| $D$. Paleozoic Era | $IV$. Mammals |
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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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