There are five guidelines for writing formal prose. what should a formal prose writer avoid doing

What a formal prose writer should avoid doing is to use slang or filling words

Explanation:

It is a very common mistake that writers in the process of describing details in their piece of work tend to add extra and unnecessary words to it. Sometimes it is that they add extra information that is quite logical for the reader to understand or deduce. Writers should avoid making wordy sentences and better making concise ones.

poop and pee and a tree

the author develops a cold, and scared tone. making the reader shudder with fear, and suddenly become cold. i'm guessing that he's writing a scary novel, or maybe about a chilly december night.