What can the reader infer about ms. shearer?

How do i can change this sentence : a modern physician in a small town not only is proficient in general medicine but surgery as well. to parallel structure?

What is a mechanism by which organisms maintain homeostasis when the level of one substance influences the level of another substance or the activity of an organ.

What is the effect of this dialogue? it creates an air of suspense in the plot. it shows how angry the characters are. o it describes details of the castle setting. o it entertains through the use of clever wording.