The bacteria that are found in human intestines that aid in digestion are an example of

parasitism
mutualism
commensalism
predator-prey relationship

The answer is mutualism. Not only does the bacteria get food, we are helped with digestion! I hope this helps ^^

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.