Abnormal levels of are linked to anxiety disorders, seizures, and insomnia.
a. gaba (gamma-aminobutyric acid)
b. norepinephrine
c. endorphins
d. acetylcholine

Answer to your question is A. Gaba. Gamma-aminobutyric acid is an amino acid which acts to inhibit the transmission of nerve impulses in the central nervous system.Its purpose is to reduce nerve excitation or stimulation. so abnormal levels can cause anxiety disorders, seizures and insomnia

Afew buddies come over to your house to hang out. they notice you're struggling in school, perhaps you have to rely on to pass your class, but you can't absorb the knowledge. they could positively reinforce getting a tutor and working with you, dedicating more time to the areas of struggle and less on hanging out to better yourself.secondly, say you're the victim of bullying. you're afraid to tell an adult because of possible repercussions from the bully himself. your friends encouraging you and pushing you towards telling an adult for your safety is another example.