If you want to set up a controlled experiment to determine the effects of caffeine on sleeping behavior in mice, you take a group of mice and divide it into two groups. Both are fed the same food, both are watered, both have 12 hours daylight, and 12 hours dark. Group one is given caffeine. What is appropriate to give to group two?
A. 2 ´ amount of caffeine
B. 1/2 ´ amount of caffeine
C. No caffeine
D. Caffeine in different form
C. No caffeine
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examining the patient's skin with a magnifying glass doing an MRI scan on the patient finding eggs in a blood sample culturing a sputum sample