Across
- 1. Treat
- 3. Bacteria
- 6. Protect human from virus
- 8. Help to prevent someone from getting a disease
- 10. Sickness; Illness
- 11. 100 years
- 12. Period of time
Down
- 2. Many people are sick at the same time
- 4. Hypothesis; not proven ideas
- 5. Causes the common cold
- 7. A way of doing something
- 9. Difficulty to do