Question

What essential characteristics does a good experiment have?

A. control group is given the experimental treatment.
B. a single variable is tested
C. a control is used
D. both B and C ​

Answer 1

D. both B and C

Step-by-step explanation:

The control group is not to be altered as to have true results for comparison/differentiation.

Answer 2

Answer is both b and c

Step-by-step explanation:

Good experiments have two essential characteristics: a single variable is tested, and a control is used. The variable is the factor that changes in an experiment in order to test a hypothesis.