Question

scientific method, conversions, classification test retake
all the things in an experiment that must be the same to make it valid are called:
○ independent variables
○ controlled experiments
○ controlled variables or constants
○ dependent variables

Explanation:

In a scientific experiment, controlled variables (or constants) are the factors that are kept the same to ensure the validity of the experiment. Independent variables are manipulated, dependent variables are measured, and a controlled experiment is the overall type of experiment.

Answer:

C. controlled variables or constants