Question

the passage below describes an experiment. mary worried about the amount of water it took to care for her lawn, so she decided to replace it with moss. she read that bacteria can help moss grow and thought that the natural bacteria in yogurt might create a good environment. to test this hypothesis, she prepared two one - foot by one - foot patches in her yard. she blended one pound of moss with one - half gallon of water and spread it across one of the patches. she then blended one pound of moss with one - half gallon of water plus one cup of yogurt and spread it across the second patch. after one month, mary measured the height of the moss in each patch. complete the sentence. in this experiment, the amount of yogurt was an independent variable a dependent variable

Explanation:

In an experiment, the independent variable is the factor that is deliberately changed or manipulated by the experimenter. Here, Mary changes the amount of yogurt (one patch has no yogurt, the other has one - cup of yogurt) to see its effect on moss growth. The dependent variable is what is measured as a result of the change in the independent variable, which in this case is the height of the moss.

Answer:

an independent variable