The sailfish, able to swim up to 68mph.
Answer:
I think this is what you're looking for?
Explanation:
1. The central nervous system including brain and spinal cord.
2. The peripheral nervous system including nerves coming out from the brain and spinal cord, i.e., cranial nerves and spinal nerves.
3. The autonomic nervous system including sympathetic nervous system and parasympathetic nervous system.
A biologist .....they study living things only.
