3. If trees in a timber cruise were found to be of many different species, would that mean that the forest could be used for timber? Explain your answer. 4. Why do you think that biodiversity is good for ecosystems?

The direction a chemical reaction occurs is represented by an arrow 

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.