| A | B |
| algal bloom | A thick layer of algae formed on a lake/pond that is so thick that sunlight and oxygen can't pass |
| aerobe | any organism that needs oxygen to survive |
| anaerobe | any organism that does not need oxygen to survive |
| antibiotic | a drug that can kill disease-causing organisms |
| antibodies | a protein produced by the body when a disease-causing organisms enter |
| bacilli | rod shaped bacteria |
| cocci | round shaped bacteria |
| endospores | a resting cell of bacteria with a tough outer covering able to withstand unfavorable conditions |
| Fleming | The man who discovered penicillium |
| Germ theory | an accepted idea that some diseases are caused by microorganisms |
| Jenner | first person to develop a vaccine |
| Pasteur | The man who proposed the germ theory |
| Ruminants | an organism that has a divided stomach to aid in digestion |
| Spirilla | spiral shaped bacteria |
| staphylo | prefix meaning bacteria that forms in clusters |
| strepto | prefix meaning bacteria that forms in chains |
| vaccine | a preparation of a dead or weakened microorganism that causes a disease |
| virus | a kind of parasite that causes diseases in living cells |