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Which of the following is the smallest?

  • A.Bacteria
  • B.Virus
  • C.Fungi

Answer: B

Correct answer: Virus

Viruses are the smallest, typically 20-300 nanometres - far below the resolution of a light microscope, which is why they were unknown until the electron microscope. Bacteria are measured in micrometres, a thousand times larger, and fungi larger still.

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