A low pitch sound example would be like a crocodile. They can produce sound so low for the human ear to hear. Thunder can also produce exceptionally low pitched sounds that are felt much as they are heard.
Answer:
1: the saying means the world can be a big stage drawing a line from reality and being deceived. Many people on this earth act is if they are in a play. Hiding behind a mask, pretending everything is okay, pretending they are saints but are only a wolf in sheep clothing.
Explanation:
D. It needs a comma before and.
I believe it would refer to intelligence quotient.