AP Biology Quiz
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ECOLOGY
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In a lab, pill bugs are placed in a choice chamber with one side dry and one side moist. Within 5 minutes, 18 of 20 pill bugs are on the moist side, and several are observed moving rapidly when they enter the dry side. When the chamber sides are switched, most pill bugs move to the newly moist side within 5 minutes. No changes in body structure are observed during the trial. Which response best explains the pill bugs' distribution across the chamber?
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