break down food into nutrients transport nutrients and oxygen remove waste products from the body defend the body against foreign invaders
I gave my students this multiple choice question: Which of these is not a function of the circulatory system?

Only one answer is correct among these 4 choices:
- break down food into nutrients
- transport nutrients and oxygen
- remove waste products from the body
- defend the body against foreign invaders

Could you tell me which one is correct?

break down food into nutrients