Two models for the speed of speciation are based on patterns in the fossil record. Which of the following statements describes the punctuated equilibrium model of evolution? A. Natural selection is unimportant as a mechanism of evolution.
B. Given enough time, most existing species will gradually branch into new species.
C. Species accumulate their unique features rapidly, then change little for the duration of the species.

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.