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The smallest organism in the human body is typically considered to be bacteria or viruses. These microorganisms can be found in various parts of the body, such as the skin, gut, and mouth.
The smallest known organism on Earth is a type of bacteria called Mycoplasma genitalium, which has a size of about 200-300 nanometers.
The five levels of organization in the body from smallest to largest are cells (e.g., muscle cell), tissues (e.g., muscle tissue), organs (e.g., heart), organ systems (e.g., cardiovascular system), and the whole organism (e.g., human).
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The individual organism is the smallest unit of ecological study, where researchers focus on the behavior, adaptations, and interactions of a single organism within its environment.
Organism is the general and therefore largest classification group for the body. The next smallest classification is the organ system.