The apple slices in Celine's lunch always turned brown by lunchtime. Celine's favorite cooking website...

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The apple slices in Celine's lunch always turned brown by lunchtime. Celine's favorite cooking website said that pouring lemon juice on the apple slices would keep them from turning brown so quickly. Celine cut an apple into eight slices. She poured two tablespoons of lemon juice over four of the slices. She did not pour lemon juice over the other four. Every hour for three hours, Celine counted the number of apple slices that had turned brown. In this experiment, which were part of a control group? the plain apple slicesthe apple slices covered with lemon juice

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