Biology
What system helps animals exchange carbon dioxide and oxygen?
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What substance, found in food, helps move wastes through the body?
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What type of plants always contain a xylem and phloem?
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Which of the following would a doctor do to look at your bones?
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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 will happen if you put a celery stalk in water colored blue from food coloring?
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Fish take in oxygen through their gills; what do insects take in oxygen through?
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