Across
- 4. a type of blood cell that digests bacteria and fungi to help fight infection
- 5. a tiny, single-celled living organism that is found almost everywhere and anywhere
- 8. a tiny, non-living particle that causes disease - it replicates itself only within the cells of living hosts
- 9. body system that protects the body from disease caused by pathogens
Down
- 1. tiny organisms (called microorganisms) that invade the body and make it sick – examples are viruses, bacteria, fungi, and parasites
- 2. a substance taken to stimulate the production of antibodies – helps the body recognize and defend against pathogens
- 3. a living animal or plant that houses and supports a parasite
- 6. a substance produced by special cell of the body that fights against the effects of a germ
- 7. simple organisms that are neither plant, animal, or bacteria and get energy from decaying material