Answer: C. Melatonin.
Explanation: Melatonin is the hormone responsible for sleep and wake cycles. :)
It is called a horizontal relationship
Answer:
you say sorry but no
Explanation:
because if you admire them and you don't want to hurt their feelings or they won't like you
<span> stimulants such as </span>dextroamphetamine act in the brain . Stimulants<span> enhance the </span>effects of chemicals in the brain
