Q: Which system in the body exchanges gases with the outside air? Read this paragraph and choose the correct option from the provided answers: The respiratory system is the body system that exchanges gases with the outside air. It brings air containing oxygen into the body for the cells. It also releases carbon dioxide from the cells into the air. This exchange of gases is called respiration. Choices: - immune - digestive - vascular - respiratory A:
respiratory

Q: What pulls skydivers towards the earth? Read this paragraph and choose the correct option from the provided answers: Skydivers are pulled towards the Earth by gravity. Gravity exerts a force on the skydivers. A force is a push or pull. Some pushes and pulls can be seen. Choices: - momentum - impact - inertia - gravity A:
gravity

Q: What are the most common types of compounds found on earth? Read this paragraph and choose the correct option from the provided answers: Cellulose is a compound found in plants. The chief component of cellulose is carbon. Cellulose is one of many carbon-based compounds that make up living things. In fact, carbon-based compounds are the most common type of compound on Earth. More than 90 percent of all known compounds contain carbon. Do you know why carbon is found in so many compounds? Read on to find out. Choices: - sodium - based compounds - ionic compounds - hydrogen-based compounds - carbon-based compounds A:
carbon-based compounds