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(B) According to the Oparin-Haldane hypothesis of chemical evolution,the primitive atmosphere of the Earth was reducing and lacked free oxygen. The fi

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Chemoheterotrophs

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(B) According to the Oparin-Haldane hypothesis of chemical evolution,the primitive atmosphere of the Earth was reducing and lacked free oxygen. The first life forms were simple,anaerobic,and heterotrophic in nature. They obtained energy by consuming the organic molecules present in the 'primordial soup' of the oceans. These organisms are classified as chemoheterotrophs because they relied on pre-existing organic compounds for their carbon and energy needs.

The first organisms to evolve on the earth were

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