The theory of "continental drift" was originally proposed by

What is evolutionary biology?

What was the final product of Miller's experiment?

Early Greek thinkers thought units of life called ....... were transferred to different planets including Earth.

$A$ : During evolution,the early time period was without an ozone layer.
$R$ : The ozone layer absorbs $U.V.$ rays to some extent.

The gases present in the primitive atmosphere were: