Dependent selection is one term that you can use for that
Answer: because oil is less dense than water and therefore it floats to the surface.
Explanation:
This is based on borderline personality disorder which is low levels of activity in anterior cingulate cortex is associated with hoarding behaviors, suicidal behavior that is 7.5% suicide over 20 years old, self-injury 2/3 ; 3/4 stabilize in 10 to 15 years, co-morbid PTSD or mood disorder, at risk for substance abuse and eating disorders, schizotypal personality disorder, might be related to dissociation identity disorder, genes account for 60% variance in developing BPD, lower serotonin function, increased activation of amygdala and disturbed connectivity b/w prefrontal cortex and the amygdala.
