Which mouth wash kills more bacteria. how do plants grown in water alone compare with plants grown in soil

1. the independent variable (the thing the person is changing) is the different type of mouthwash. the dependant variable (the affect of the independent variable) is how much bacteria the mouthwash kills

2. the independent variable for this one would be the plants growing in soil or water, and the dependant variable is how do the plants grow.

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