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Levels of biological hierarchy


All the environments on earth that are inhabited by life


All the living things in a particular area


Entire array of organisms in an ecosystem


All individuals of a species in the bounds of a specific area


Individual living things

Organs and organ systems

Organs carry out particular function in the body. Organ systems are teams of organs that cooperate in a specific function


Groups of similar cells


Fundamental units of structure and function


Carious functional components that make up cells


Chemical structure with two of more atoms

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