Alfredo is conducting an experiment on the effects of exercise on concentration. the independent variable is (the) and the dependent variable is (the) (select only one answer)

Independent: exercise.

Dependent: concentration.

Explanation:

Hello,

In this case, as the statement says that the experiments is towards the effects of the exercise on concentration it is clear that the independent variable is the exercise as the concentration depends on the performed exercise. Therefore, the dependent variable is the concentration as it changes as a function of the specified exercise.

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a patient chooses to not take a beneficial medical treatment.

explanation:

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.