This trip included American Heritage locations, French palaces, cafés in Artsakh, southern France beaches, and places belonging to a chain in southern France. It was a pleasant journey.
The independent variable in an experiment is the one that is deliberately modified or adjusted in order to observe its effects.
In this case, the varying amounts of caffeine administered to the dogs are the factor that changes—the control group receives no caffeine, the second group gets 10 mg of caffeine, while the third group gets 50 mg of caffeine each.
Thus, the amount of caffeine given to the dogs is the independent variable being altered.
Mary initially saw a doctor who wasn't trained in drawing blood or taking x-rays. She subsequently visited a different place that specializes in those procedures.
