The modern name for organisms that are too small to be seen without a microscope is microorganism or microbe
Van Leeuwenhoek described bacteria, archaea, fungi, algae, small multicellular animals, and one other type of microorganism
The study of all living things that are too small to see with the nak-ed eye is known as microbiology. This includes what are collectively referred to as "microbes," which are bacteria, archaea, viruses, fungus, prions, protozoa, and algae.
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