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An exchange surface in direct contact with the external environment is found in the
Q9: A short-day plant exposed to nights longer
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Q23: At the end of a nonpregnant ovarian
Q39: Hydrogen ions produced within human red blood
Q51: Auxin enhances cell elongation in all of
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Q72: An example of a pathogen that undergoes
Q75: Charles and Francis Darwin concluded from their
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Q116: Which of the following will dissolve in