Which element should formal writing always include

Formal writing will ALWAYS include complete sentences.

Explanation:

This is confused with formal letters and usually answered that it should include a signature. But the correct answer if complete sentences because it won't matter if you put a signature at the end if your sentences are incomplete.

do you have more to the question?

answer: "the beating heart symbolizes the narrator's conscience, or his sense of guilt and wrongdoing" so its b

explanation:

"to look at him, or hear him describe it, he had no guilt. however, poe decided to symbolize this man's subconscious guilt through the heartbeat."