Pigs, spiders, elephants, and other animals that rely solely on instinct act as they do because they lack a
a. cerebral cortex
b. brain
c. central nervous system
d. moral compass

disorders of the brain include both behavior disorders and other psychiatric illnesses. the primary difference between a behavior disorder and another type of psychiatric disorder is the presence of choice. psychiatric conditions are considered to be involuntary while in behavior disorders, choices are essential.