Answer:
"Beatles' drummer, Richard Starkey, was born in Liverpool, England, so he is known to the world as Ringo Starr", has a clear and concrete writing error. Thus, the word "so" has no reason to be in said wording, as the fact that Richard Starkey was born in Liverpool is in no way a condition for the world to know him as Ringo Starr. In other words, the word "so" as a connector within the sentence does not follow logical parameters, as it does not deal with a cause-consequence situation.
The answer to the question is informal
Maintaining eye contact with the speaker
I think.
because you could be writing notes, and that doesn't include eye contact
Declarative sentence because you are saying that you are meeting for pizza at noon today. it states what you are doing.
