What connection can be made between the function of neurons and the chemical adenosine? A. They are both produced in the brainstem. B. They both help a person to stay awake. C. They are both produced at the base of the brain. D. They both help in the process of falling asleep.

## Step 1<br />The problem is asking us to identify the correct connection between the function of neurons and the chemical adenosine. <br /><br />## Step 2<br />Neurons are the basic working unit of the brain, a specialized cell designed to transmit information to other nerve cells, muscles, or gland cells. They play a crucial role in the functioning of the nervous system.<br /><br />## Step 3<br />Adenosine is a chemical that is produced in the brain. It is known for its role in promoting sleep and relaxation. When adenosine levels increase, it promotes sleepiness and relaxation.<br /><br />## Step 4<br />Based on the above information, we can conclude that the correct answer is D. They both help in the process of falling asleep. This is because adenosine promotes sleepiness and relaxation, which are essential for the process of falling asleep.