In multicellular organisms, the body is a system of multiple interacting subsystems. These subsystems are groups of cells that work together to form tissues and organs that are specialized for particular body functions.

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Credits:
Respiratory system model made with Biorender.com:
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"Epithelial Tissues Stratified Squamous Epithelium" by Berkshire Community College Bioscience Image Library [Public domain], via Wikimedia commons:
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"Russian nesting dolls" by Bill Damon, licensed under a Creative Commons Attribution License (CC BY 2.0):
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