Automobiles cause air pollution when they burn gasoline. laws have been passed to make automobile manufacturers limit the amount of pollution released from automobiles. which act or organization was most likely responsible for these laws?

Clean Air act //this requires the environment protection agency

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.