Unicellular Organisms
Unicellular Organisms: Unicellular organisms are organisms that have just one cell. Their size is as small as a speck of dust, and they can live in water, in soil, and in or on organisms that have more cells than they do. Unicellular organisms can be harmful, but many also make life on Earth possible.
Examples:
Phytoplankton live in the ocean, where they are the basic food source for other organisms.
Bacteria are decomposes, so they help to break down the matter in an organism whit it dies. They convert the nitrogen in soil into a form that can support plant life.
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