Across
- 3. period
- 6. someone who studies to discover new knowledge.
- 8. not proved yet
- 9. prevents disease
- 12. the invasion of the body by harmful germs.
Down
- 1. Same
- 2. 100 years
- 4. stop something from happening.
- 5. people receiving medical care.
- 7. high temperature
- 10. a business
- 11. a small