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what system is responsible for the exchange of oxygen and carbon dioxide between the air and the cells?
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Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different
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Polar zones are cold and tend to be dry because of a pressure system of cold. low high
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what system is responsible for the exchange of oxygen and carbon dioxide between the air and the cel...
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