The first life on Earth was ...... .

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(B) According to the Oparin-Haldane hypothesis and modern evolutionary biology,the first life forms on Earth were simple,anaerobic,and chemoheterotrop

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Chemoheterotrophs

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(B) According to the Oparin-Haldane hypothesis and modern evolutionary biology,the first life forms on Earth were simple,anaerobic,and chemoheterotrophic organisms. These organisms obtained their energy and carbon from the organic molecules present in the 'primordial soup' of the early Earth's oceans. They existed before the evolution of photosynthesis or complex metabolic pathways.

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