Question

When we say that an experiment is controlled, we mean that _____.

A.
the outcome is certain


B.
the theory has already been supported


C.
there is only one theory being tested by the experiment


D.
there is only one difference between experimental groups

Answer 1

I believe the answer is D. there is only on difference between experimental groups

Answer 2

Option C

Explanation:In a controlled experiment, only one independent variable is the only factor that is to be adjusted, while the dependent one acts as the factor that the independent variable will affect.