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Living organisms which are invisible to the naked eye are called _________ .

  • A.Particles
  • B.Molecules
  • C.Microorganisms
  • D.Macroorganisms

Answer: C

Correct answer: Microorganisms

Organisms too small to be seen without a microscope are microorganisms - bacteria, protozoa, many algae and fungi, and viruses. The category is defined by size alone, so it contains organisms of quite unrelated kinds.

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