Organisms

An organism is an individual, either single-celled (unicellular) or many-celled, which represents the complete framework of organ systems, organs, and all other components that carry out the processes of a living thing. Plants, animals, humans, bacteria, and other forms of life are examples of organisms.

Unicellular organisms have only one cell but they can function and perform independently. They can either be a eukaryote (cell with nucleus) or a prokaryote (cell without a nucleus). A bacterium is an example of a prokaryote while an amoeba is an example of a eukaryote.