C) When you breathe normally, you take in air through
your nose or mouth
Explanation:
A complex sentence is a sentence that contains an independent clause and one or more dependent clauses. An independent clause can stand alone as a sentence, but a dependent clause even though it has a subject and a verb cannot stand alone. Here are some examples of complex sentences.
A) Refugees from Southeast Asia seeking to escape political persecution, especially the refugees from Vietnam who fled persecution after the Vietnam War.