Biology / Bio 0062 · Atom · ~20 seconds
Levels of Organization: Tissue to Organism
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Cells of a similar kind form tissues, tissues combine into organs, organs into organ systems, and organ systems into one organism.
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Heart muscle cells form cardiac tissue, part of the heart, which works with vessels as the circulatory system in one animal.
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A single-celled organism skips every rung between cell and organism, since one cell is already the whole living thing.