Photoautotrophs, Heterotrophs, and Chemoautotrophs
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State
A photoautotroph builds its own organic molecules using light energy; a heterotroph consumes other organisms' molecules instead; a chemoautotroph builds its own from inorganic chemicals.
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Plants and cyanobacteria are photoautotrophs, animals and fungi are heterotrophs, and deep-sea vent bacteria are chemoautotrophs.
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All three end up with organic molecules — what separates them is where their energy and carbon come from.
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- Nothing — this is a starting point.