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DNA ( Element, Molecule, Cell, Tissue, Organ, Organ System )
Femur _( Element, Molecule, Cell, Tissue, Organ, Organ System )__
Hydrogen ( Element, Molecule, Cell, Tissue, Organ, Organ System )
Osteoblast ( Element, Molecule, Cell, Tissue, Organ, Organ System )
Glucose ( Element, Molecule, Cell, Tissue, Organ, Organ System )
Skeleton ( Element, Molecule, Cell, Tissue, Organ, Organ System )