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The definition of an organism is a creature such as a plant, animal or a single-celled life form, or something that has interdependent parts and that is being compared to a living creature. An example of an organism is a dog, person or bacteria.
Cells are considered to be the smallest living organisms in the world. There are single celled organisms and multi-celled organisms. An example of a single celled organism is â¦ an algae, and an example of a multi-celled organism is is a human. 1 person found this useful.his is because there is an upper size limit to cells before they become unable to acquire nutrients through diffusion. Cells really can't be much larger than they are in most multicellular organisms. Therefore, if there's an organism is larger, it isn't because it's cells are bigger but because they have more cells.