Across
- 3. a tiny nonliving particle that replicates in a living cell.
- 5. eukaryotic organisms that are not animals, plants, or fungi.
- 6. organisms that benefit from living on, with, or within a host.
- 7. single celled organisms that lack a nucleus.
- 9. an organism that provides a source of energy for a virus.
Down
- 1. a group of similar closely related organisms.
- 2. the broadest level of organization of organisms.
- 3. a substance that consists of weakened pathogens.
- 4. a group of similar organisms that can reproduce and the offspring can reproduce.
- 8. the scientific study of how organisms are classified.