Question

which of the following parts of the human body is most complex heart kidney white blood cell central nervous system

Explanation:

The central nervous system controls and coordinates all body functions, consists of the brain and spinal cord with complex neural - networks, compared to the other options which have more specific and less comprehensive functions. The heart is a muscular organ for circulation, the kidney is for filtration, and a white blood cell is a single cell in the immune system.

Answer:

D. central nervous system