history

3. The Romans built these to transport fresh water to highly populated areas.
4. a heart monitor invented by Willem Einthoven in the early 1900’s
7. an organism that can be seen only through a microscope. Examples include bacteria, protozoa, algae, and fungi.
8. of the Four Humours The belief that the substances that make up the human body are: black bile, yellow bile, blood, and phlegm
9. to give a weak form of a disease to a person or animal, usually by injection, as a protection against that disease
11. A substance that stops or slows down the growth of microorganisms
12. scanner A powerful Xray that provides a cross-section of the human body invented in 1972

1. heating liquid or food to kill microorganisms
2. An unpleasant or unhealthy smell or vapour.
5. protected against, not affected by a disease
6. medicines that treat infections by killing bacteria
10. substance used to stimulate the production of antibodies and provide immunity against a disease