Question

From simplest to most complex the four levels of organization of the human body are
a. tissues, cells, organs and organ systems.
b. cells, tissues, organs and organ systems.
c. organ systems, tissues, cells and organs.
d. cells, organs, tissues and organ systems.

Answer 1

the answer would have to be B 
because cells make tissues 
and tissues make organs
and organs make organ systems
hope that helped