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QUESTION
Dan wants to test the effects of different amounts of antibiotics on bacteria. While setting up his experiment, he makes sure to use the same type of antibiotic, the same type of bacteria, and the sam
Dan wants to test the effects of different amounts of antibiotics on bacteria. While setting up his experiment, he makes sure to use the same type of antibiotic, the same type of bacteria, and the same type of incubator for each trial. Which phrase below best describes this part of the experiment?
