Across
- 2. a submicroscopic infectious agent that replicates inside the living cells of an organism
- 3. a blood protein that identifies and neutralizes foreign objects
- 6. bean-shaped structure that filters substances(two words)
- 7. microorganism that cause disease
- 8. primary lymphoid organ
- 9. illness that is caused by something that would not usually cause any harm(two words)
Down
- 1. occurs when body's natural defense system can't tell the difference between your own cells and foreign cells(two words)
- 4. ubiquitous,free-living organisms often consisting of one biological cell
- 5. type of autoimmune disorder
- 8. develop from stem cells in the bone marrow