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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 → red blood cell → nerves
C. heart tissue → brain → circulatory system
D. bone tissue → skeletal system → bone


Sagot :

Final answer:

Cells are the basic building blocks of the human body, which combine to form tissues, organs, and organ systems.


Explanation:

Cells are the simplest living unit of the human body, followed by tissues that are formed by a group of cells with similar functions. These tissues combine to form organs, which then work together in organ systems like the skeletal and muscular systems.


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