Birds are evolved from
Non-chordates
Reptiles
Amphibians
Fishes
Archeopteryx, a transitional fossil between birds and reptiles was discovered from the rocks of following period
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
Amphibia first appeared in which of the following period?
Primates originated about