Emerging viruses that infect human cells can originate from which of the following sources?

• A. Mineral deposits
• B. Synthetic chemicals
• C. Atmospheric gases
• D. Animal reservoirs

Answer: (D)

Verified step by step guidance

1. Understand the concept of emerging viruses: these are viruses that have recently appeared in a population or are rapidly increasing in incidence or geographic range.
2. Recognize that emerging viruses often originate from sources that allow them to jump from one species to humans, a process known as zoonosis.
3. Evaluate the given options: mineral deposits, synthetic chemicals, and atmospheric gases are non-living and do not serve as hosts or reservoirs for viruses.
4. Identify that animal reservoirs are living hosts where viruses can persist and evolve before infecting humans, making them a common source of emerging viruses.
5. Conclude that among the options, animal reservoirs are the correct source of emerging viruses that infect human cells.