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The carbon cycle

Description
Most carbon is in Earth’s rocks, where it is largely unavailable to living organisms.

1 Carbon enters land food webs when plants take up carbon dioxide from the air for use in photosynthesis.

2 Carbon returns to the atmosphere as carbon dioxide when plants and other land organisms carry out aerobic respiration.

3 Carbon diffuses between the atmosphere and the ocean. Bicarbonate forms when carbon dioxide dissolves in seawater.
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