digestive and circulatory digestive and endocrine nervous and respiratory nervous and excretory
I gave my students this multiple choice question: The human body is made up of organ systems that work together as one unit. Which systems work together to prepare and distribute food for cells?

Only one answer is correct among these 4 choices:
- digestive and circulatory
- digestive and endocrine
- nervous and respiratory
- nervous and excretory

Could you tell me which one is correct?

digestive and circulatory