The first organisms to evolve on Earth were-

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(C) According to the Oparin-Haldane hypothesis,the early atmosphere of Earth was reducing and lacked free oxygen. The first life forms evolved in the

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Heterotrophs

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(C) According to the Oparin-Haldane hypothesis,the early atmosphere of Earth was reducing and lacked free oxygen. The first life forms evolved in the 'primordial soup' of organic molecules. These early organisms were unable to synthesize their own food and relied on the pre-existing organic molecules in the environment for nutrition. Therefore,they were heterotrophs.

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