Home Biology Ecosystem Decomposition Most of the world's carbon is found
Biology Ecosystem Decomposition Single Correct MCQ
Published on: August 13, 2026

Most of the world's carbon is found

A
as carbon dioxide in the atmosphere.
B
in living organisms. .
C
as bicarbonate and carbonate ions dissolved in the oceans.
D
as carbonate minerals in sedimentary rock.

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The correct answer is:
D

Most of Earth’s carbon is stored in rocks like limestone and other sedimentary carbonates, not in the atmosphere or living organisms.

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