Q: What is the process in which gases are exchanged between the body and the outside air? Read this paragraph and choose the correct option from the provided answers: Respiration is the process in which gases are exchanged between the body and the outside air. The lungs and other organs of the respiratory system bring oxygen into the body and release carbon dioxide into the atmosphere. Choices: - ingestion - metabolism - precipitation - respiration A:
respiration

Q: What is the term for a substance that causes the speed of a reaction to increase? Read this paragraph and choose the correct option from the provided answers: A catalyst is a substance that increases the speed of a reaction. Overall, a catalyst is not a reactant and is not used up, but it still affects how fast a reaction proceeds. However, a catalyst does not affect the extent or position of a reaction at equilibrium. It helps a reaction achieve equilibrium faster. Choices: - indicate - component - monite - catalyst A:
catalyst

Q: What monitors the level of carbon dioxide in the blood? Read this paragraph and choose the correct option from the provided answers: The regular, rhythmic contractions of the diaphragm are controlled by the brain stem. It sends nerve impulses to the diaphragm through the autonomic nervous system. The brain stem monitors the level of carbon dioxide in the blood. If the level becomes too high, it "tells" the diaphragm to contract more often. Breathing speeds up, and the excess carbon dioxide is released into the air. The opposite events occur when the level of carbon dioxide in the blood becomes too low. In this way, breathing keeps blood pH within a narrow range. Choices: - the lungs - the heart - the kidneys - the brain stem A:
the brain stem

Q: Where do most cnidarians live? Read this paragraph and choose the correct option from the provided answers: Cnidarians are invertebrates such as jellyfish and corals. They belong to the phylum Cnidaria. All cnidarians are aquatic. Most of them live in the ocean. Cnidarians are a little more complex than sponges. They have radial symmetry and tissues. There are more than 10,000 cnidarian species. They are very diverse, as shown in Figure below . Choices: - grass - hills - rocks - ocean A:
ocean