Question

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

Answer 1

no caffein,there is a factor that must not be changed when conducting an experiment,known as controlled variable