atom - smallest unit of an element, molecule - smallest unit of a compound, organelle - a tiny structure in a cell that carries out a specific function, cell - the smallest unit of structure and function of an organism, tissue - a group of similar cells that perform a specific function in an organism, organ - a structure in a body that carries out a specific function and is made up of different types of tissue, organ system - a group of organs that work together to perform a major function in the body, organism - a living thing, population - all the members of one species in a particular area, community - all the different populations that live together in an area, ecosystem - all the living and nonliving things that interact in an area, biosphere - the parts of the Earth and surrounding atmosphere where there is life,

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