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| 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. Picture Stats: Views: 92 Filesize: 439.56kB Height: 1042 Width: 1668 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=47237 |