Which of the following is polar? a. a molecule which has a partial positive charge on one atom and a partial negative charge on another atom
b. an atom that has donated an electron to another atom
c. an atom that has accepted an electron to another atom

Reproduction i think

The answer is c the potato slice shriveled because water moved out of the slice into the salt solution

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.