1. An experiment is performed on orange trees to see how different liquids affect orange tree growth. Each orange tree in the experiment is given a different liquid; water, apple juice, or
milk. Each orange tree has the same amount of soil, same amount of sunlight, and the same
amount of liquid. In this experiment, what is the independent variable?
a. Type of tree
b. Amount of sunlight
c. Tree growth
d. Different liquids