Question

Which of the following statements about a controlled experiment is accurate? a. All the variables must be kept the same. b. Only one variable is tested at a time. c. Everything can be studied by setting up a controlled experiment. d. Controlled experiments cannot be performed on living things

Answer 1

B.

Step-by-step explanation:

Only one variable is altered at a time in a "controlled experiment." The rest of the variables should be kept the same or “controlled.”

Answer 2

only one variable is tested at the same time