Biology
What system helps animals exchange carbon dioxide and oxygen?
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What hereditary disease allows large amounts of mucus to build up in the lungs?
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Which of the following human traits can be used, like fingerprints, for identification?
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What is the name of the tube that carries blood to the heart?
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Which glycoprotein is mainly responsible for recurring outbreaks of influenza?
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Some insects in the north produce what chemical to serve as a natural antifreeze in the winter?
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What type of creature generally lives on land but starts life in the water?
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