kim25463 kim25463

27-09-2022
Biology

Answered

Experiment 4: Mouthwash
Scientists wanted to determine the most effective mouthwash. They had three groups of volunteers. One group used 10 mL of Listerine mouthwash, one group used 10 mL of ACT mouthwash and one group used 10 mL of water. All participants ate the same foods the day of the experiment and swished the mouthwash for 30 seconds. The scientist took a swab of the inside right cheek of each participant. After 24-hours the scientist counted the number of bacterial colonies that formed on a Petri dish from the mouth swab.

What is the independent variable and dependent variable? How do you know?

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