Biology

What system helps animals exchange carbon dioxide and oxygen?

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What word means "terrible lizard"?
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What is another name for the portion of Earth that sustains life?
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What animal has the biggest and heaviest brain among all animals?
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Which of these animals is extinct?
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Which of the following does NOT grow on a tree?
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What was the dominant invertebrate of Mesozoic seas?
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In which of these would botulism more likely be found?
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How does an insect smell?
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