Across
- 3. The system responsible for taking in oxygen and releasing carbon dioxide.
- 5. The waste product of cellular respiration.
- 6. A gas you breathe in that's needed for cellular respiration.
- 7. The system that breaks down food into nutrients.
- 9. The smallest unit of life.
Down
- 1. The process your body uses to convert food into energy
- 2. The system that pumps the blood .
- 4. Tiny structure in cells where energy is produced.
- 8. The basic sugar that provides energy to cells.