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What does a model of the carbon cycle show?

The amount of Earth’s carbon increases.
The amount of Earth’s carbon cannot be determined.
The amount of Earth’s carbon is constant.
The amount of Earth’s carbon decreases.*
Select the correct answer from the list.
Scientists believe that the Select Answer explain why Earth’s Select Answer fluctuated between glacial periods and interglacial periods.
A= low temperatures, sea levels, Milankovitch Cycles, tilt of Earth's axis.
A= sea levels have, low temperatures have, climate has, tilt of Earth's axis has.

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