Across
- 4. the body's use of molecules for energy and growth.
- 6. the body system that takes in food and breaks it down.
- 8. a molecule that an organism can use to release energy.
- 10. the body system that transports molecules to and from all cells of the body.
Down
- 1. a group of atoms joined together in a particular way.
- 2. the body system that takes in oxygen and releases carbon dioxide.
- 3. cellular _____: the chemical reaction between oxygen and glucose that releases energy into cells.
- 5. _____ acid: molecules that are the building blocks of protein.
- 7. smallest unit of life.
- 9. a molecule that organisms get from air and water around them to release energy.