Across
- 3. foreign substance in the body
- 4. immunity that develops throughout our lives
- 6. tiny, single-celled organisms that get nutrients from their environments and cause illness
- 8. some of these are parasites and need a living organism to live
- 11. the bodies defense against infection
- 12. help the body remember the invaders and destroy them
- 13. immunity that is borrowed from another source and lasts for short times
Down
- 1. plant-based organisms that cause things like athlete's foot and yeast infections
- 2. immunity that people are born with, like skin
- 5. destroy invading organisms like bacteria
- 7. these need to use another cell's structures to reproduce, they cause illness
- 9. vaccines work by making these which stay in our bodies and prevent future illness
- 10. help antibodies attack antigens