Which compound has very important role in prebiotic evolution?
$SO _{2}$
$NO$
$CH _{4}$
$SO _{3}$
The origin of seeds in the land plants was achieved about $345 \;million$ years ago, in lineages recognised as ancestral to all more advanced vascular plants in
The ‘Recapitulation Theory’ was put forth by
Which one is vestigial organ of man
Forelimbs of cat, lizard used in walking; forelimbs of whale used in swimming and forelimbs of bats used in flying are an example of
Natural selection leads to the directional change when