Answer
Based on the provided diagram: Atmosphere – source; Factories, power stations, and vehicle emissions – source; Fossil fuels (coal, oil, natural gas) – source; Plants – sinks; Animals – source. Explanation: As illustrated in the diagram, the atmosphere is a source of carbon due to the presence of carbon dioxide gas. Factories, power stations, and vehicle emissions contribute to carbon levels by releasing carbon dioxide as a result of burning fossil fuels for energy. Fossil fuels, when combusted, produce large quantities of gases including carbon dioxide, identifying them as a source of carbon. In contrast, plants act as carbon sinks since they absorb carbon dioxide during photosynthesis. Conversely, animals produce carbon dioxide as a waste product of respiration, categorizing them as a source as well.
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