Which can be used to characterize blood flow in the human body? ?

a: There is a unidirectional blood flow. 
d: Arteries carry blood away from the heart.
e: Veins carry blood toward the heart.

Personality is a mixture of characteristics/qualities that form an individual's distinctive persona. it can be influenced by environmental and biological factors; one's culture is a most important factor that shape personality. extreme mood swings, unstable relationships, distorted self-image, impulsive/risky behavior, explosive anger, chronic feelings of sadness/emptiness, etc. these could indicate that someone could have a personality disorder.

Ithink this is safety needs.