The rule for controls is that
a. controls are only necessary if you're not doing an experiment
b. everything should remain the same between experimental groups
c. there should be only one independent variable and one dependent variable
d. the only change we make between experimental groups is to the independent variable

Describe the change in phase and temperature as water moves from the oceans to the atmosphere and then returns to earth again as rain. a) evaporation : temperature increases; condensation : temperature decreases; precipitation (rain) : temperature decreases b) evaporation : temperature increases; condensation : temperature decreases; precipitation (rain) : temperature increases c) evaporation : temperature decreases; condensation : temperature decreases; precipitation (rain) : temperature decreases d) evaporation : temperature increases; condensation : temperature increases; precipitation (rain) : temperature decreases