Across
- 3. immunity defense system
- 5. a virus or bacterium
- 9. multicellular organisms having adequate biological defenses to fight infection
- 11. defenses, defenses of the body
- 12. cell cell
- 13. basic biological unit of all known organisms
Down
- 1. immunity defense system
- 2. a form of small white blood cells
- 4. cell a type of cell
- 6. defense system
- 7. a toxin which induces an immune response in the body
- 8. is a virus
- 10. killer cells, cells