You must check adequate breathing before giving breaths to an unresponsive adult victim do this by looking for chest rise and feeling airflow through the nose or mouth What other?

In addition to looking for chest rise and feeling airflow through the nose or mouth, you should also listen for the sound of breathing. You can do this by placing your ear close to the victim's mouth and nose. If you do not see, hear, or feel breathing, you should start rescue breaths.