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such as animals and fungi, are not capable of carbon fixation but are able to grow by consuming the carbon fixed by autotrophs or other heterotrophs.

Seven natural autotrophic carbon fixation pathways are currently known:"Fixed carbon," "reduced carbon," and "organic carbon" may all be used interchangeably to refer to various organic compounds.

Net vs. gross CO₂ fixation

The primary form of fixed inorganic carbon is carbon dioxide (CO₂).

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