Q: What is the process in which gases are exchanged between the body and the outside air? Choices: - ingestion - metabolism - precipitation - respiration A:
respiration

Q: What is the term for a substance that causes the speed of a reaction to increase? Choices: - indicate - component - monite - catalyst A:
catalyst

Q: What monitors the level of carbon dioxide in the blood? Choices: - the lungs - the heart - the kidneys - the brain stem A:
the brain stem

Q: Where do most cnidarians live? Choices: - grass - hills - rocks - ocean A:
ocean