Seriously you want us to write you an entire essay?! What are you on because if your acting like this I need some of it.
He was focused on salvaging St. Peter's Cathedral. Afterwards, he designed a new church which is a hallmark of English Baroque.
Answer: One author claims that dogs bred to be tiny may have weak nerves
Explanation: The research word "claim" in this sentence is used correctly, and not to mention the fact that it is more likely for this word to come from a reliable source, such as a person that has written a book at least <em>once </em>in his or her life. (I've done this quiz).
The key signature allows the composer to use less accidentals which makes the music less cluttered. Just like the other person who answered this said when a score with multiple instruments is written it is almost always all in the same key to keep the music organized (their answer is better)