The purpose of controlling an experiment is to . A. double-check your own work B. compare one theory to another theory C. prevent the question from being testable D. make sure the results of the experiment are useful

D

Make sure the results of the experiment are useful

Explanation:

In an experiment, certain variables (independent variables) are controlled to check how they affect other variables (dependent variables) and understand the relationship between them. Also, these experiments usually have a control experiment, of no change, to help compare results and increases their reliability.

an honest friend. a friend who cares about me, and wont use me. a friend that i can trust. not someone who is fake

mark this brainliest lol i need one more.

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.