organ system -> tissue -> cell -> organ tissue -> cell -> organ -> organ system organ -> organ system -> tissue -> cell cell -> tissue -> organ -> organ system
I gave my students this multiple choice question: Which sequence lists the levels of organization in the human body from simplest to most complex?

Only one answer is correct among these 4 choices:
- organ system -> tissue -> cell -> organ
- tissue -> cell -> organ -> organ system
- organ -> organ system -> tissue -> cell
- cell -> tissue -> organ -> organ system

Could you tell me which one is correct?

cell -> tissue -> organ -> organ system