The reproductive organs produce sex cells. The nerves carry signals from the eye to the brain. The bones and muscles of the hand work together to grip a pencil. The muscles of the chest tighten to push carbon dioxide out of the lungs.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which best describes two organ systems working together to help maintain homeostasis?
Possibilities:
- The reproductive organs produce sex cells.
- The nerves carry signals from the eye to the brain.
- The bones and muscles of the hand work together to grip a pencil.
- The muscles of the chest tighten to push carbon dioxide out of the lungs.

The muscles of the chest tighten to push carbon dioxide out of the lungs.