Biology

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

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Which of these animals might use a coral reef for hiding and protection?
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What habitat do caribou live in?
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What is the opening in your eye called?
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What substance in your ears helps keep germs and dirt out?
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What is a name for a substance that your body needs for energy and growth?
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What is another name for the portion of Earth that sustains life?
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What was the dominant invertebrate of Mesozoic seas?
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What group of animals do snails, slugs and octopuses belong to?
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