While some carbon accumulates in the atmosphere the rest is taken up by

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BlackTom AI · Accepted Answer

The question asks where carbon accumulates when it is not in the atmosphere. 
Because the provided answer indicates 'Oceans and terrestrial systems,' we can focus on what these two reservoirs do. 
Oceans absorb carbon dioxide from the atmosphere; CO2 dissolves in seawater and is transported into deeper waters, where it participates in chemical forms such as bicarbonate and carbonate, effectively storing carbon for long periods. 
Terrestrial systems, meaning land-based reservoirs like soils, vegetation, and other biomass, also accumulate carbon through processes such as photosynthesis (plants fixing CO2 into organic matter), soil organic carbon buildup from plant and microbial residues, and carbon stored in forests and soils for varying timescales. 
If options had included only atmospheric processes or other unrelated reservoirs, those would be incomplete because, while the atmosphere is a carbon reservoir, the question specifically asks where carbon accumulates besides the atmosphere. 
In chemistry and climate science, carbon exchange among the atmosphere, oceans, and land biosphere is central; the oceans and terrestrial ecosystems act as major sinks that remove CO2 from the air. 
Since the options are not provided in the prompt, we cannot critique each incorrect choice individually, but we can emphasize that any correct completion would include these two major sinks, whereas alternatives that misstate the roles of these reservoirs or omit them would be inaccurate.

BIOEE1610 Lecture 19: Post-Lecture: C02 Cycle S22V2

While some carbon accumulates in the atmosphere the rest is taken up by

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