Across
- 3. Tiny living organisms made of a single cell
- 5. A tiny infectious particle that must enter a living cell to reproduce
- 6. Able to spread from one person to another
- 7. A substance that helps the body prepare to fight a disease
- 10. Chemicals used to kill or stop the growth of bacteria
- 11. The body's fighters against disease
Down
- 1. To make more of the same kind of organism
- 2. The instuctions that tell an organism what to do
- 4. The ability of bacteria to survive an antibiotic
- 8. When harmful microorganisms enter and multiply in the body
- 9. A living organism that a virus uses to reproduce