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(C) The earliest organisms on Earth were chemoautotrophs or heterotrophs that evolved in an anaerobic environment. However,the question implies a comp

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Plants perform photosynthesis

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(C) The earliest organisms on Earth were chemoautotrophs or heterotrophs that evolved in an anaerobic environment. However,the question implies a comparison to autotrophic organisms. The evolution of photosynthesis (specifically oxygenic photosynthesis by cyanobacteria) was a landmark event that allowed organisms to produce their own food using sunlight,water,and $CO_2$. This ability to synthesize organic compounds from inorganic sources is a fundamental characteristic shared with plants,making the first autotrophic organisms functionally similar to plants in their mode of nutrition.

The first organisms to appear on Earth were more like plants because:

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