Question

Dan wants to test the effects of different amounts of antibiotic on bacteria. While setting up his experiment he makes sure to use the same type of antibiotic, the same type of bacteria, and the same type of incubator for each trial. Which phrase below best describes this part of the experiment?

A.
analyzing results
B.
collecting data
C.
choosing controlled variables
D.
making a prediction

Answer 1

The answer is c, because a variable is kind of a factor for instance would it effect your outcome, and in the question dan is setting it up all the same.

Answer 2

The answer is C.
hope this helps.