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(B) The evolutionary sequence of life on Earth is as follows:$1$. First heterotrophic prokaryotes $(I)$: These were the earliest life forms that utili

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$I, III, II, IV$

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(B) The evolutionary sequence of life on Earth is as follows:$1$. First heterotrophic prokaryotes $(I)$: These were the earliest life forms that utilized existing organic molecules for energy.$2$. First autotrophic prokaryotes $(III)$: As organic resources became scarce,organisms evolved the ability to synthesize their own food (e.g.,chemosynthesis and later photosynthesis).$3$. First eukaryotes $(II)$: These evolved from prokaryotes through endosymbiosis,characterized by a membrane-bound nucleus and organelles.$4$. First animals $(IV)$: Multicellular eukaryotic organisms appeared much later in the evolutionary timeline.Therefore,the correct chronological order is $I, III, II, IV$.

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	$IV$. $2000 \, mya$

Given below are some major events in the early history of life:
$I.$ First heterotrophic prokaryotes
$II.$ First eukaryotes
$III.$ First autotrophic prokaryotes
$IV.$ First animals
Choose the correct sequence of these evolutionary events.

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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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Given below are some major events in the early history of life:$I.$ First heterotrophic prokaryotes$II.$ First eukaryotes$III.$ First autotrophic prokaryotes$IV.$ First animalsChoose the correct sequence of these evolutionary events.