what is the variable that may change as a result of a change in the variable the experimenter changes

This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic

Compare the composition of the moon's surface with the composition of the earth's surface.

How have high taxes on tobacco products impacted the number of people who use them? a. the number of tobacco users has increased. b. the number of tobacco users has decreased. c. the number of tobacco users has not changed. d. the number of adolescent tobacco users decreased, while the number of adult users increased