A student is conducting their science experiment on the effect of caffeine on dogs. He has 3 groups of test subjects. The 1st group of dogs receives plain water. The 2nd group of dogs receives 10 mg of caffeine each, and the 3rd group receives 50 mg of caffeine each. He will
measure their activity levels by recording how long each dog runs without stopping, after giving them the pills. What is the control group in
this experiment?
A. The dogs that receive water.
B. The dogs that receive 10 mg of caffeine.
C. How the activity levels are measured.
D. How the caffeine is given to the dogs.

A. The dogs that receive water.

Explanation:

In an experiment, we have the control group and the experimental groups. As opposed to the experimental group, the CONTROL GROUP is that group that does not receive any of the experimental treatment (independent variable).

According to this question, a student is conducting an experiment to test the effect of caffeine on dogs. The student uses 3 groups of dogs and gives each group the following respectively: plain water, 10mg caffeine, 50mg caffeine. The control group, which is the group that doesn't receive the caffeine (test material) is the dogs that receive water (GROUP 1).

download the app called socratic on your phone