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Which lists three living units of the human body in order from the simplest to the most complex level of organization?
red blood cell → circulatory system → blood
nervous system → nerves → brain
red blood cell → heart tissue → circulatory system
bone tissue → skeletal system → bone
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red blood cell → heart tissue → circulatory system
Reason: a red blood cell is a cell (simplest), heart tissue is a tissue (higher level), and the circulatory system is an organ system (more complex). The other choices are not in increasing complexity.
Reason: a red blood cell is a cell (simplest), heart tissue is a tissue (higher level), and the circulatory system is an organ system (more complex). The other choices are not in increasing complexity.
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