Which term best describes an organism that is microscopic?

Which term best describes an organism that is microscopic?

• A. Microorganism
• B. Immunity
• C. Direct Transmission
• D. Systemic Infection

Answer: (A)

The concept being tested is identifying the term for organisms that are so small they must be seen with a microscope. That term is microorganism, which covers tiny life forms like bacteria, viruses, fungi, and protozoa. The other options describe aspects of disease or the body's response rather than the size of an organism: immunity refers to the body’s defense against pathogens, direct transmission is about how infections spread from one host to another, and systemic infection describes an infection that affects multiple body parts. So the best answer is microorganism.

The concept being tested is identifying the term for organisms that are so small they must be seen with a microscope. That term is microorganism, which covers tiny life forms like bacteria, viruses, fungi, and protozoa. The other options describe aspects of disease or the body's response rather than the size of an organism: immunity refers to the body’s defense against pathogens, direct transmission is about how infections spread from one host to another, and systemic infection describes an infection that affects multiple body parts. So the best answer is microorganism.