Dust mites foraging for human skin on a bedsheet.
Black Garden Ant Eye
Image: Damselfly (© Callista Images/cultura/Corbis)
Volvox Colony, image from Science Photo Library.
E. coli--part of the normal flora of the human gut. Certain strains of E. coli produce various toxins that cause illness
Optic neurons in blowfly . Nicholas J. Strausfeld, UofA
Cell cross-section under a microscope
Mark Mawson photography