nervous system digestive system circulatory system respiratory system
I gave my students this multiple choice question: On a class field trip, Zach took a walk through the woods using his senses. Zach made observations on the different sights, smells, and sounds in the woods. What system transferred the observations from his senses to his brain?

Only one answer is correct among these 4 choices:
- nervous system
- digestive system
- circulatory system
- respiratory system

Could you tell me which one is correct?

nervous system