I believe the answer is Spelling because spelling errors can throw of the whole paper .
The substitution of an agreeable or inoffensive expression for one that may offend or suggest something unpleasant also : the expression so substituted.
Answer:What internal and external conflicts are displayed in dear Martin?
Explanation:An internal conflict is the struggle occurring within a character's mind. Things such as the character views for, but can't quite reach. External conflict occurs between two or more characters, or a character and his environment; external conflict involves an interaction with the setting and other characters of the story.