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What produces almost one-half of the earth's oxygen through photosynthesis?

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What produces almost one-half of the earth's oxygen through photosynthesis?

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protists

Humans could not live on Earth if it were not for protists. Why? Plant-like protists produce almost one-half of the oxygen on the planet through photosynthesis. Other protists decompose and recycle nutrients that humans need to live. All protists make up a huge part of the food chain.

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