1. Which of the following best describes the difference between the procedures used in Experiments 1 and
Experiment 2?
A.
In Experiment 1, the temperature was varied; in Experiment 2, the diameter of the tube was varied.
In Experiment 1, the diameter of the tube was varied; in Experiment 2, the temperature was varied.
In Experiment 1, the distance between the swabs was varied; in Experiment 2, the temperature was varied.
In Experiment 1, the temperature was varied; in Experiment 2, the distance between the swabs was varied.
D.
