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Microorganisms are organisms so small that they are invisible to the naked eye and can only be observed with the help of a microscope. Micro-organisms exist in the most varied habitats: in the air, soil, water, inside our bodies or on the walls of our homes, for example. To develop they need adequate conditions of humidity, temperature, oxygen and nutrients. We can identify several groups of micro-organisms: Protozoa (Trypanosoma brucei - sleeping sickness); Bacteria (Escherichia coli); Viruses(Ebola Virus) and Microscopic Fungi(Mold Fungus). Important micro-organisms for humans: Pathogenic microorganisms (they cause diseases such as flu, pneumonia, athlete's foot and sleeping sickness) and Useful micro-organisms (they are useful in the daily life of human beings, for example, the yeasts that we use to make bread or the bacteria in yogurt).
