Which property of water is especially helpful to aquatic (water-dwelling) animals in very cold climates? A. water's ability to dissolve many substances
B. ice has a lower density than liquid water
C. water's high surface tension
D. water's high heat of vaporization

It allows water to resist freezing and thawing cycle.

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.