31. Virus range in size from A.2 nm to 70 nm B.2 nm to 100 nm C.2 nm to 200 nm D.2 nm to 300 nm
Answer: Option D Solution: A virus is an infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria. They range in size from about 20 to 300 nanometres in diameter.
