Which structure starts at the brain and goes down the back? a) the spinal cord b) the brain stem c) the cerebral cortex d) the limbic system

The spinal cord.

Explanation:

The brain and the spinal cord are attached and the spinal cord from the head goes down to back of the body.

The spinal cord acts as the framework for the backbone and helps in performing various functions of the body. The spinal cord connects the higher centers of the body to the various parts of the body by the help of autonomic and somatic veins of the peripheral nervous system.

answer; /// i believe the correct answer is (reactants);

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.