Producers take in carbon dioxide, and consumers release it. That is option B.
A food chain is made up of producers, consumers, and decomposers. Producers are the plants, consumers are plant eaters (animals) and decomposers feed on the dead plants and animal organic remains.
The plants makes use of carbondioxide and energy form Sunday during photosynthesis to produce sugar while the consumers during the process of aerobic respiration, gives out carbondioxide.
Therefore, carbon moves through a food chain as part of the carbon cycle when producers take in carbon dioxide, and consumers release it.
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