Functional sees society as acting like an organism BECAUSE every aspect of society serves a specific function (like a cell, everything does something to contribute to the whole
I believe the answer is: <span>genetic predisposition and childhood trauma
Genetic predisposition could affect the hormonal balance that could affect our response to stressful stimulus.
Childhood trauma could also make adults felt sudden anxiety on certain situations that remind them to the traumatic experience that felt during the childhood.</span>