To test the effectiveness of a new supplement, one group is given the supplement, and the other group is not given anything. which is the most complete list of the parts of an experiment presented in this scenario?
independent variable, dependent variable
control group, experimental group, dependent variable
independent variable, control group, experimental group
control group, experimental group

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.