| A | B |
|---|
| virus | tiny, nonliving particle that invades and multiplies inside a living cell |
| host | living organism that provides a source of energy for a virus or an organism |
| parasite | organism that lives on or in a host and causes it harm |
| bacteriophage | virus that infects bacteria |
| vaccine | substance introduced into the body to stimulate the production of chemicals that destroy specific viruses |
| bacteria | single celled organism that lacks a nucleus |
| binary fission | process in which one cell divides to form two identical cells |
| asexual reproduction | involves only one parent and the offspring is identical to the parent |
| sexual reproduction | involves 2 parents that combine genetic material |
| decomposer | organisms that break down large chemicals in dead organinsms into small chemicals |
| protist | eukaryotes that cannot be classified as plants, animals, or fungi |
| pseudopod | temporary bulges of a cell used for movement |
| cilia | hairlike projections from cells that move with a wavelike motion |
| flagella | long, whiplike structure used for movement |
| algae | plantlike protists |
| spore | tiny cell that is able to grow into a new organism |
| fungi | eukaryotes with cell walls, heterotrophs that absorb their food and use spores |
| budding | form of asexual reproduction in which small organisms grow off of the parent |
