What are the advantages of having both a nervous system and an endocrine system?

The nervous system has been regarded as the main system of the body for it is responsible for the regulation of the processes and the one that coordinates with the other systems. On the other hand, the endocrine system is the system that is responsible for the release of different chemicals in the body for different processes. In short, the nervous system regulates the release of the endocrine system depending on the need of the body. Hope this answer helps.

The answer is a if u read the definition it makes sense