First mammals appeared around - Vidyadip

MCQ

First mammals appeared around

A
$459\; million$ years back
✓
$220\; million$ years back
C
$1600 \;million$ years back
D
$3800\; million$ years back

✓

Answer

Correct option: B.

$220\; million$ years back

b
Mammals first appeared in triassic period of mesozoic era.

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