The picture below shows the structure of serotonin. 
a.From which amino acid is serotonin derived?
b.What are the structural differences between serotonin and this amino acid?
c.What is the function of serotonin?
d.Which illness can be caused by reduced levels of serotonin in the brain?
Definitions:
Conditioning Theory
A psychological theory that involves learning associations between behaviors and their consequences through reinforcement or punishment.
Training Process
A systematic approach to developing and delivering instructional materials and activities to meet learners' needs and objectives.
Formal Processes
Established, recognized procedures and methods followed within an organization to accomplish tasks or achieve objectives.
Informal Programs
Learning initiatives that occur outside of a formal educational or training structure, often characterized by self-directed or experiential learning approaches.
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