#### Answer

During a controlled experiment, all variables remain constant, whilst one variable is manipulated or tested to determine its overall effect on the system that is being studied.

Chegg costs money, GradeSaver solutions are free!

Published by
W. H. Freeman

ISBN 10:
1-31901-016-4

ISBN 13:
978-1-31901-016-4

You can help us out by revising, improving and updating this answer.

Update this answerAfter you claim an answer you’ll have **24 hours** to send in a draft. An editor
will review the submission and either publish your submission or provide feedback.