9 levels of organization (from smallest to largest)
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#1
Atom
#5
Cell
#2
Molecule
#7
Organ
#8
Organ system
#4
Organelle
#9
Organism
#6
Tissue
#3
macromolecule
#1
Atom
#5
Cell
#2
Molecule
#7
Organ
#8
Organ system
#4
Organelle
#9
Organism
#6
Tissue
#3
macromolecule