[Solved] Which type of speech has never been determined by the Supreme Court to be protected speech under the First Amendment? A)fighting words B)obscenity and pornography C)hate speech D)student speech E)commercial speech Norepinephrine: A neurotransmitter and hormone involved in arousal and alertness, as well as in the stress response. Serotonin: A neurotransmitter that contributes to feelings of well-being and happiness, playing a key role in regulating mood, appetite, and sleep. Neurotransmitters: Chemicals found within the nervous system that transmit signals from one nerve cell to another, influencing mental and physical processes. Mood Disorders: comprises a category of mental health disorders characterized by significant and persistent disturbances in a person's mood, affecting their emotional state and daily functioning.