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The two main variables in an experiment are the independent and dependent variable. An independent variable is the variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable. A dependent variable is the variable being tested and measured in a scientific experiment.

Answer:

given in explanation.

Explanation:

Independent variable is one which is controlled or changed by the scientist.

In this question  the variable statement is

Watering the plant with different concentration of salt. Concentration of salt is controlled by the Marty so it is independent.

Dependent variable is one  which is being tested or measured in an scientific experiment.

Marty measuring the sunflower height after the experiment is dependent  variable.

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