Which behavior requires help from the nervous system?

The correct answer is Blinking your eyelid

The nervous system is a complex network of nerves and nerve cells that carry messages to and from the brain and spinal cord to all parts of the body. The nervous system controls and coordinates all bodily functions, including movement, breathing, digestion, and reproduction. Blinking is a reflex action that is controlled by the nervous system. When the eye is touched or irritated, the nervous system sends a signal to the muscles around the eye to close the eyelid. This reflex action helps to protect the eye from damage.