STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Protozoan. Coloured scanning electron micrograph (SEM) of a protozoan. Protozoa are unicellular eukaryotic organisms, that usually are not photosynthetic. Eukaryotic organisms have membrane-bound nuclei and DNA (deoxyribonucleic acid) arranged into chromosomes. Most protozoa are aquatic and some are important parasites of other organisms.
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