Question

the levels of organization for structure and function in the human body from least complex to most complex are
a) cells → tissues → organs → systems
b) cells → organs → tissues → systems
c) systems → organs → tissues → cells
d) tissues → systems → cells → organs

Explanation:

Cells are the basic unit of life. Tissues are made up of similar cells. Organs are composed of different tissues. Systems are formed by multiple organs working together. So the order from least complex to most complex is cells → tissues → organs → systems.

Answer:

A. cells → tissues → organs → systems