Cell, tissue, organ and organ system are the levels of organization in the human body from the smallest to the largest component.
Cell is the basic structural and functional unit of an organism.
Tissue is formed by the group of cells.
Organ is formed by the group of tissues.
Organ system is formed by the group of organs.
Levels are the arrangements.
Organization is the hierarchy of biological systems.
Therefore those are the organization levels in the human body.
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