Which lists three units of an organ system in order from the simplest to the most complex? a. red blood cell â†’ heart â†’ tissue b. skeleton â†’ bone â†’ bone cell c muscle cell â†’ muscle tissue â†’

Which lists three units of an organ system in order from the simplest to the most complex? a. red blood cell â†’ heart â†’ tissue b. skeleton â†’ bone â†’ bone cell c muscle cell â†’ muscle tissue â†’ stomach d. lung tissue â†’ lung â†’ circulatory system

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