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Multicellular organisms have a hierarchical structural organization: cells make up tissues, tissues make up organs, and organs make up organ systems. Organ systems work together to carry out the many functions of the organism.
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Credits:
"The Galaxy Within" by Dchordpdx, licensed under a Creative Commons Attribution License (CC BY 4.0):
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"Cerebral lobes" by unknown, licensed under a Creative Commons Attribution License (CC BY-SA 3.0):
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