The first mammals were like …$A$… Their fossils are small sized. Mammals were …$B$… and protected their unborn young inside the mother's body
Choose the correct option for $A$ and $B$ to complete the given $NCERT$ statement
Ancestral amphibians were tetrapods that evolved during
What were the characteristics of life forms that had been fossilised ?
The Permian period, during which the first most modern orders of insects appeared, occurred approximately
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