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

The correct answer is option C which is red blood cell → heart tissue → circulatory system.

Explanation:There are organizational levels from the simplest to the complex as:The starting and smallest level is cells. After that, there comes the tissue level. Tissues of different types combined to form the organ level and then comes the system consisting of many levels.According to the above organizational level, only option C shows the correct arrangement of organizational levels from the simplest to the complex.

Gucci gang gucci gang gucci gang gucci gang