$I.$ Oparin's theory of origin of life is based on $....A......$
$II.$ Chemical theory of origin of life was given by $....B......$
$A$ -biological evolution, $B$ -Oparin
$A$ -Elemetal evolution, $B$ -Haldane
$A$ -organic evolution, $B$-Oparin and Haldane
$A$ -Chemical evolution,$B$-Oparin and Haldane
Origin of earth dates back to
Contribution of scientist : Louis Pasteur $($ in $1860)$, Oparin and Haldane.
$A$ : During evolution the early time period was without ozone layer.
$R$ : Ozone layer absorbs $U.V.$ rays to some extent.