Question

what happens to the independent variable in an experiment? *
it equals the hypothesis
it is control group
it remains constant
it is purposely and carefully changed/tested

Explanation:

In an experiment, the independent variable is the factor that the researcher manipulates or changes to observe its effect on the dependent variable. It is not the hypothesis, not the control group, and does not remain constant.

Answer:

D. it is purposely and carefully changed/tested