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Evolution of life forms from non-living organic molecules cannot occur now because of the

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increasing global warming at present

presence of oxygen in the atmosphere

thinning of the ozone layer and exposure to UV

absence of substrates available in the primitive earth

answer is B.

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Detailed Solution

The oxidizing atmosphere of today is not conducive to the spontaneous synthesis of complex molecules because the oxygen attacks chemical bonds, extracting electrons.

The primitive earth had a reducing atmosphere.

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