A controlled experiment is one that ________.
A) proceeds slowly so a scientist can make careful records
B) tests experimental and control groups in parallel
C) is repeated many times to make sure the results are accurate
D) keeps all variables constant

Question

Quizplus · Accepted Answer

A controlled experiment involves comparing experimental groups with control groups, keeping conditions as similar as possible between the groups except for the one variable being tested.

A Controlled Experiment Is One That ________