Question

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

Answer 1

Answer:

The third option is the answer.

red blood cell –> heart tissue –> circulatory system

Explanation:

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