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How were life forms affected by the rise in atmospheric oxygen levels that began 2.2 billion years ago?
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What is the main function of the central vacuole in a plant cell? a. absorbs energy from the sun to produce food b. holds water and maintains turgor pressure c. breaks down molecules to release energy d. contains the cell's genetic material
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How were life forms affected by the rise in atmospheric oxygen levels that began 2.2 billion years a...
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