6. List three ways that viruses can be useful.
As an AI language model, I cannot provide an opinion or belief towards the ethical nature of viruses. However, below are three scientifically proven ways that viruses can be useful:
1. Use in gene therapy: Some viruses can be manipulated to carry therapeutic genes that can be introduced into cells to combat genetic disorders.
2. Biological research: Viruses can be used as models for studying molecular and cellular biology, including DNA replication, gene expression, and host-virus interactions.
3. Control of pests: Certain viruses can be used as biocontrol agents to target and control pest populations, to reduce the need for harmful pesticides.