Question

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 → brainc. red blood cell → heart tissue → circulatory system d. bone tissue → skeletal system → bone

Answer 1

red blood cell → circulatory system → blood

nervous system → nerves → brain

red blood cell → heart tissue → circulatory system

bone tissue → skeletal system → bone

The correct order as required is - red blood cell → heart tissue → circulatory system

Step-by-step explanation:

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