Across
- 5. Hypothesis that viruses originated from genetic elements that developed the ability to escape one cell and enter another
- 6. Tiny organisms that can infect animal and plant hosts
Down
- 1. Virus responsible for the recent pandemic
- 2. Hypothesis that viruses evolved first or coevolved alongside their current cellular hosts
- 3. Hypothesis that viruses evolved from complex, free-living cellular organisms
- 4. Virus that completes its lifecycle in approximately 52 hours