Across
- 5. The powerhouse of the cell
- 7. Instrument used to view very small objects
- 8. Organ responsible for pumping blood
- 9. Unit of electrical resistance
- 11. Planet known as the "Red Planet"
- 12. Study of living organisms
- 13. A gas we breathe out
Down
- 1. The process of plants making food using sunlight
- 2. The center of an atom
- 3. The largest planet in our solar system
- 4. The force that pulls objects toward Earth
- 6. Study of the universe
- 10. Chemical symbol for water