The body of a multicellular organism, such as a tree or a cat, shows organization at several levels. The hierarchy of organization seen in complex multicellular organisms is categorized into levels that evolve increasingly complex, from atoms at the primary level, biological molecules, organelles, cells, tissues, organs, organ systems, and then the whole organism itself.
The most complex level of organization is the organismal level, where all eleven organ systems conduct in the human organism, the whole living individual.
Multicellular organisms require additional resources than unicellular organisms. The cells are specialized and must rely on each other for the survival of the organism.
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