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==VIRUSES ARE PARASITES, WHICH MEANS THAT THEY CAN ONLY SURVIVE INSIDE THE CELLS OF OTHER LIVING THINGS! THEY CAUSE VERY INFECTIOUS DISEASES SUCH AS CHICKEN POX, MEASLES ETC. VIRUSES ARE THE SMALLEST OF THE MICRO-ORGANISMS AND CAN ONLY BE SEEN WITH A VERY POWERFUL MICROSCOPE. ==

==Viruses are also included, although they cannot live or reproduce on their own. They are particles, not cells; they consist of deoxyribonucleic acid (DNA) or ribonucleic acid (RNA), but not both. ==

==**Viruses invade living cells—bacteria, algae, fungi, protozoa, plants, and animals (including humans)—and use their hosts' metabolic and genetic machinery to produce thousands of new virus particles.** ==

==Rickettsias and chlamydiae are very small cells that can grow and multiply only inside other living cells. Although bacteria, actinomycetes, yeasts, and molds are cells that must be magnified in order to see them, when cultured on solid media that allow their growth and multiplication, they form visible colonies consisting of millions of cells. ==

For thousands of years, people had no concept or knowledge of organisms invisible to the naked eye.
In 1854, Louis Pasteur in France found that spoilage of wines was due to microorganisms (bacteria) that convert sugars to lactic acid, rather than the alcohol produced by yeasts. Seeds for plants germinate in the soil surrounded and covered with microorganisms. A pinch of dirt can contain a billion microorganisms of many types. ^  These are picture of Microorganisms

Blue-green algae of the genus Spirulina have been harvested from ponds and eaten for centuries by the ancient Aztecs in Mexico and Africans in the region of Lake Chad.