Question

Which best describes the purpose of a controlled experiment?

to make sure the results of the experiment support the hypothesis
to prevent a dangerous condition resulting from a reaction
to examine whether one variable causes a change in another
to prevent an undesired change in a variable

Answer 1

not 100% sure but i would say to prevent an undesired change in a variable

Answer 2

Answer: To examine whether one variable causes a change in another

Step-by-step explanation: