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
First mammals appeared around
Find out through internet and popular science articles whether animals other than man have self-consciousness.
Birds and mammals in geological development of earth arose in period
First mammals appeared in the period