Which of the following best describes an example of a nonspecific external response to infectious agents?
a: phagocytes consume infectious agents through the process of endocytosis.
b: the presence of infectious agents causes inflammation and swelling in localized areas.
c: sweat creates an acidic environment, which inhibits growth of infectious agents.
d: memory b cells recognize infectious agents and destroy them before they can enter the body.

Keyword on this question would be external so while A is biologically correct, it happens internally so it's wrong. Inflammation and swelling occurs below skin surface so internal as well. C is an external response while D is also internal. So your answer would be C

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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.