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Based on the correct levels of organization, Why is the skin considered an organ?
1) chemical-cellular-tissue-organ-organ system-organism. Organs interact to form systems.
2) cellular-chemical-tissue-organ-organ system-organism. Organs are a combination of cells.
3) organism-organ system-organ-tissue-cellular-chemical. Organs are a combination of tissues.
4) Organs are a combination of molecules.