Body Organization Answers

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Which lists three units of an organ system in order from the simplest to the most complex?

A
red blood cell → heart → tissue
B
skeleton → bone → bone cell
C
muscle cell → muscle tissue → stomach
D
lung tissue → lung → circulatory system
5

Which lists three living units of the human body in order from the simplest to the most complex level of organization?

A
red blood cell → circulatory system → blood
B
nervous system → nerves → brain
C
red blood cell → heart tissue → circulatory system
D
bone tissue → skeletal system → bone

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