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Biology
What gas do plants take in that humans give off when they breathe?
Biology
What gas do plants take in that humans give off when they breathe?
Oxygen
Carbon Dioxide
Hydrogen
Helium
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Now extinct, what shark is thought to have been the largest ever on Earth?
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What system helps animals exchange carbon dioxide and oxygen?
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What animal builds lodges, dams up rivers and has large front teeth for gnawing?
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Which of these is not an insect?
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Which theory states that living things come only from other living things?
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