Question

a biologist working to understand and combat the evolution of viruses and bacteria would most likely be working in which field? biotechnology epidemiology ecology

Explanation:

Epidemiology focuses on the spread and impact of infectious diseases (like those caused by viruses and bacteria), including their origins, causes, and effects. Biotechnology is more about using biological systems for technological applications (e.g., genetic engineering in crops), and ecology is about the relationships between organisms and their environment. Since the question is about understanding and combating the evolution of disease - causing agents (viruses and bacteria), epidemiology is the most relevant.

Answer:

epidemiology