some members of the normal microbiota can become opportunistic pathogens when given the proper conditions. one example given in the activity is the overgrowth of clostridium difficile in an individual undergoing antibiotic therapy. why might antibiotics increase the chances of an opportunistic infection by the normal microbiota?

B

Were is the question

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.