organ system, organ, cell, tissue organ, tissue, cell, organ system tissue, cell, organ system, organ cell, tissue, organ, organ system
I gave my students this multiple choice question: From simplest to most complicated, how are multicellular organisms organized?

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

Could you tell me which one is correct?

cell, tissue, organ, organ system