First mammals appeared around
First mammals appeared around
- A
$459\; million$ years back
- B
$220\; million$ years back
- C
$1600 \;million$ years back
- D
$3800\; million$ years back
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The first mammals were like ...$A$... Their fossils are small sized. Mammals were ...$B$... and protected their unborn young inside the mother's body
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Choose the correct option for $A$ and $B$ to complete the given $NCERT$ statement