Answer:
the decomposition of plants on the forest floor
Explanation:
The biosphere is one of the layers made up of the Earth surface where life prevails and exists. It is also called the ecosphere cause all the ecosystems lives and resides in this sphere.
Dead animals and plants move the carbon directly from the biosphere to the geosphere.
Carbon is an important element and is essential for the formation of carbon dioxide essential for the photosynthesis process by the plants to make food and energy along with oxygen molecules.
The plants and animals have some amount of carbon present in them in various compounds and elemental forms. When the animals and plant die their body gets decomposed by certain microorganisms.
The inorganic and the organic carbon present in the dead body gets released into the soil or the geosphere directly.
Therefore, dead animals and plants contribute carbon to the geosphere.
Learn more about the carbon cycle and geosphere here:
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