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Single-celled organisms, also known as unicellular organisms, are fascinating examples of life that exist solely as a single cell. These organisms can be found in various environments, from the deepest oceans to the highest mountains, and even in extreme conditions such as inside rocks and inside other organisms. Despite their simplicity, they play crucial roles in ecosystems and are essential for the survival of more complex life forms. In this article, we will explore the characteristics, diversity, and significance of unicellular organisms in the natural world.