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Which lists three units of an organ system in order from the simplest to the most complex?
red blood cell → heart → tissue
skeleton → bone → bone cell
muscle cell → muscle tissue → stomach
lung tissue → lung → circulatory system
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muscle cell → muscle tissue → stomach
This follows the correct simplest-to-most-complex order for body organization: cell → tissue → organ (the stomach). The other choices are either out of order or mix different systems (e.g., lungs are part of the respiratory, not circulatory).
This follows the correct simplest-to-most-complex order for body organization: cell → tissue → organ (the stomach). The other choices are either out of order or mix different systems (e.g., lungs are part of the respiratory, not circulatory).
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