Ancestral amphibians were tetrapods that evolved during
Jurassic period
Cretaceous period
Devonian period
Carboniferous period
Seed ferns originated in
Did aquatic life forms get fossilised ? If, yes where do we come across such fossils ?
Dinosaurs became extinct in
The existence of marsupials in Australia and New Zealand prove
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