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(A) Louis Pasteur $(1860)$ performed experiments using swan-necked flasks to reject the theory of spontaneous generation (abiogenesis). He demonstrate

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Louis Pasteur: Theory of Biogenesis; Oparin and Haldane: Theory of Chemical Evolution.

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(A) Louis Pasteur $(1860)$ performed experiments using swan-necked flasks to reject the theory of spontaneous generation (abiogenesis). He demonstrated that life arises only from pre-existing life.Oparin and Haldane proposed the theory of chemical evolution. According to them,the first form of life originated from pre-existing non-living organic molecules (like $RNA$,proteins,etc.) through a series of chemical reactions in the primitive atmosphere.

Column-$I$	Column-$II$
$(X)$ Earth	$(1)$ $20$ billion years
$(Y)$ Universe	$(2)$ $4.5$ billion years
$(Z)$ Non-cellular life	$(3)$ $3.0$ billion years

What were the contributions of the scientists Louis Pasteur $(1860)$,Oparin,and Haldane to the study of the origin of life?

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Match the following columns:
Column-$I$ Column-$II$
$(X)$ Earth $(1)$ $20$ billion years
$(Y)$ Universe $(2)$ $4.5$ billion years
$(Z)$ Non-cellular life $(3)$ $3.0$ billion years

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