What were the first organisms on Earth?

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(B) According to the Oparin-Haldane hypothesis and the chemical evolution theory,the first life forms on Earth were simple,anaerobic,and heterotrophic

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Chemoheterotrophs

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(B) According to the Oparin-Haldane hypothesis and the chemical evolution theory,the first life forms on Earth were simple,anaerobic,and heterotrophic organisms. These organisms obtained their energy by consuming organic molecules present in the 'primordial soup' of the primitive ocean. Since they relied on external organic sources for energy and carbon,they are classified as chemoheterotrophs. Autotrophs evolved much later after the depletion of organic molecules.

Column-$I$	Column-$II$
$P$. Origin of Earth	$I$. $4500 \, mya$
$Q$. Origin of Life	$II$. $4000 \, mya$
$R$. Origin of first cellular life	$III$. $3000 \, mya$
$S$. Origin of first non-cellular life	$IV$. $2000 \, mya$

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Match the following columns:
Column-$I$ Column-$II$
$P$. Origin of Earth $I$. $4500 \, mya$
$Q$. Origin of Life $II$. $4000 \, mya$
$R$. Origin of first cellular life $III$. $3000 \, mya$
$S$. Origin of first non-cellular life $IV$. $2000 \, mya$

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