Zoom in on microorganisms

The microscopic world

Bacteria and yeasts in the mouthZoomZoom (91KB)
© Dennis Kunkel Microscopy, Inc.

As diversified as the animal world that we know so well, the microscopic world contains many microorganisms, most of which are very useful. They can be grouped into five large families:

  • viruses,
  • bacteria,
  • fungi (yeasts and molds),
  • algae,
  • protozoa.