history

2. an unpleasant smell or vapour.
4. substance that slows down or stops the growth or microorganisms.
6. to give a weak form of disease to a person or animal, usually by injection, as a protection against disease.
8. a powerful X-ray that provides cross section of the human body, invented in 1972.
9. the Romans built these to transport fresh water to highly populated areas.
10. the belief that the substances that make up the body are; black bile, yellow bile, blood, and phelgrem.
11. an organism that can only be seen through a microscope.
12. heating liquid food to kill microorganisms.

1. protection against, or not affected by a disease.
3. medicines that treat infections by killing bacteria.
5. a substance that is used to stimulate the production of antibodies to provide immunity against disease.
7. a heart monitor created by Willem Einthoven in the early 1900's.