Are viruses living?

• A. YES
• B. POSSIBLY
• C. SOMETIMES
• D. NO

Answer: (D)

The idea being tested is what counts as living. A living thing typically carries out metabolism, grows, responds to the environment, and can reproduce and evolve on its own. Viruses do have genetic material and can evolve over time, which shows they’re organized and adaptable. But they don’t carry out metabolic processes on their own; they can’t generate energy or synthesize molecules without infecting a host cell. They also can’t grow or reproduce independently—they hijack a cell’s machinery to replicate. Because they rely entirely on another organism’s systems to function, they’re generally considered nonliving particles rather than living organisms. Some scientists note their ability to evolve, but that alone isn’t enough to call them alive since metabolism and independent reproduction are missing.