Which neurotransmitter is a major regulator of mood and behavior and can be chemically altered using drugs like Prozac or Zoloft? a) nitric oxide
b) substance P
c) norepinephrine
d) serotonin
e) acetylcholine

Explanation:

Serotonin is an inhibitory neurotransmitter that  responsible for regulating the bodies mood and behavior in the central nervous system and affect the functions of the entire body. Prozac and Zoloft are antidepressants that help retain more serotonin neurotransmitters in neurons.

d) serotonin

they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom

the cytokine-activated janus kinase (jak)-signal transducer and activator of transcription (stat) pathway has an important role in the control of immune responses. dysregulation of jak-stat signaling is associated with various immune disorders.