Answer these questions. True or False. All animal cells need oxygen.
How does cellular respiration produce energy?
What is the function of the diaphragm?
What occurs during the gas exchange when breathing?
List three parts of the circulatory system.
What is the function of the artery?
How does the circulatory and respiratory systems work together?

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.