Biology

What gas do plants take in that humans give off when they breathe?

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What vitamin does the sun's ultraviolet rays help the skin produce?
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What group of animals is warm-blooded and has fur or hair?
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Which of these body parts takes in food?
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What is the period of growth before birth called?
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Which one of the following animals hatches from an egg outside the mother's body?
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What scientists study insects?
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What is the liquid in your mouth that helps soften food called?
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Where in the body is blood produced?
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