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STD 12 - 6. evolution — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYSTD 12 - 6. evolution1 Mark
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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