The correct answer is d. spinal cord.
Spinal cord is a bundle of neurons which starts from the brain and runs down the entire length of the back of the body. The spinal cord acts as a main means to transmit the messages between the brain and the body.
Sensory or efferent neurons carry the information from the perimeter of the body and pass to the central nervous system whereas the motor or efferent neurons act as a communication channel and carry the information from the nervous system to various glands and muscles.
Explanation:
Well the human body cells are the basic units of life. Which one thing is that a group of our cells that be working together it's rather for a specific function form of tissues. Organs are two or more of the tissues that work or perse operate together as buddies. Also they separate as organs work together forming body systems.
HOPE THIS HELPS!!
Its c the number of chromosomes in a cell. I hope this helped
