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All of the ecosystems in the world make up the biosphere.
Plants take in carbon dioxide and release oxygen, thus transferring carbon from the atmosphere into the biosphere, where it stays until the plant dies.
The science class learned about the different types of ecosystems that make up the biosphere and made projects to display them.
Since she lived in the same geographic region for her whole life, she was exposed to only a small part of the biosphere.
It would involve human beings in helping to sustain the earth's biosphere.