Across
- 1. Some are helpful to living things and some cause disease
- 7. provides external protection against pathogens that may enter the body.
- 8. A specialized protein that binds to an antigen and tags it for destruction
- 10. recognize and attack foreign substances in the body.
- 12. Disease caused by heredity or environmental factors
- 13. A disease caused by a pathogen
Down
- 2. Made up of tissues and specialized white blood cells that attack foreign substances in the body
- 3. is a substance that triggers a response by the immune system, and can be a pathogen or any foreign material in the body.
- 4. They decompose, or break down dead plants and animals for use by other organisms
- 5. An organism, virus, or protein that causes disease
- 6. is a substance prepared from killed or weakened pathogens
- 9. An organism that lives and feeds on another organism
- 11. Tiny particles that have their own genetic material but depend on living things to reproduce
- 14. The ability to resist or recover from an infectious disease