(Need it 3 hours) Separation Anxiety Disorder (Just focus on answering the question I posted)

(Need it 3 hours) Separation Anxiety Disorder (Just focus on answering the question I posted)

(Need it done in 3 hours) What are the following biological and physiological factors that may explain the causes of separation anxiety disorder or what are the changes in these factors that are attributed to separation anxiety disorder? 1. Brain structure and function 2. Neurotransmitter 3. Hormones