Seed ferns originated in
Carboniferous period
Devonian period
Silurian period
Cretaceous period
Fact.
Jurassic period of the mesozoic era is characterised by
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
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