Two objects are placed a certain distance from each other. The amount of gravitational force between the two objects depends on their masses and the distance between them.
As the masses of the objects decrease, the force of gravity between them
As the distance between the objects decreases, the force of gravity
between them
A. decreases; decreases
В. increases; decreases
C. decreases; increases
D. increases; increases

The answer is a because - is an direction

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.