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Bacteria are found everywhere, from the tropical rainforests to the peak of Mount Everest, from the frozen poles to boiling water, and even the deepest Mariana trench. We do not only have the earth to ourselves but we share it with millions of other microorganisms. Bacteria are single-celled organisms. They are so small that as many as 1 million of them can fit into a head of a pin. Some examples are viruses, bacteria, protists and fungi.
Viruses: Viruses are the smallest microorganisms. One influenza virus needs to be magnified 400,000 times to be seen by the bare eye.
Influenza Virus
Protists: There are at least 40,000 different species of protists, and they live anywhere there is water. Protists have their own kingdom. An example of a protist is Amoeba proteus. Like many other protists, the structure of Amoeba proteus is relatively simple. It is a single celled organism that appears transparent.
Protist Picture
Fungi: Fungi has its own kingdom. You may think of Fungi as mushrooms, but there are some fungi that you can only see with a microscope like yeast and slime molds.
Fungi Picture
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