| A | B |
|---|
| Virus | tiny paricles that invade living cells |
| parasite | an organism that lives off another causing it harm |
| host | the home or food source of a parasite |
| electron microscope | allowed scientists to see viruses |
| vaccines | weakened viruses that allow the body to produce antibodies that prevent infection |
| monerans | tiny one celled organisms that have no nucleus |
| bacteria | another name for monerans |
| 2.5 million | the number of bacteria thought to be in a gram of soil |
| capsule | the coating outside the cell wall in a bacteria |
| flagella | whiplike tail |
| heterotrophs | organisms that find their food |
| autotrophs | organisms that make their own food |
| decomposer | organisms that breaks down dead organisms |
| endospore | bacteria form these when conditions are unfavorable |
| symbiosis | relationship that is good for all parties |
