Across
- 3. of energy
- 6. an explanation of a natural process that is always true
- 9. a very small unit of life
- 10. a self-contained unit within a cell with a specific
- 11. a branch of science that studies heat and other
- 12. a repeated movement in a substance or field of energy
Down
- 1. to maintain life
- 2. the money remaining after paying expenses
- 4. the process by which a living organism uses
- 5. the process by which a living organism maintains a stable internal environment
- 7. being neither good nor bad
- 8. a disturbance that moves through a substance