| A | B |
| virus | a piece of hereditary material with a coat of protein. |
| host | the living thing in which another organism lives. |
| monerans | they are single-celled microscopic organisms. |
| flagella | a moneran that has whiplike structures. |
| cocci | round or egg-shaped bacteria. |
| bacilli | rod-shaped bacteria |
| spirilla | spiral-shaped bacteria |
| aerobe | bacteria that requires oxygen. |
| anaerobes | bacteria that does not require oxygen.. |
| binary fission | when a bacterial cell divides into two identical bacterial cells. |
| endospore | a bacterium with a thick protective wall. |
| decomposer | feeds on dead plants and animals for energy. |