| A | B |
|---|
| immune system | the body's general defense against diseases |
| moneran | a one-celled organism without a nucleus |
| blue-green bacteria | one-celled, chlorophyll-containing organisms without a nucleus |
| toxins | chemical poisons |
| communicable disease | diphtheria or tuberculosis, for example |
| bacteria | one-celled organisms without a nucleus that feed on organic matter, living or dead |
| antibody | a protein that the body produces to defend against infection |
| vaccine | a substance designed to produce immunity to a disease |
| antibiotic | a substance designed to stop bacteria from growing and reproducing |
| virus | a tiny disease-causing agent |
