Final answer:
Temperament refers to a person's typical way of thinking, behaving, or reacting and is believed to have a biological basis. It can influence a person's adult personality.
Step-by-step explanation:
Temperament refers to a person's typical way of thinking, behaving, or reacting. It is often considered to have a biological basis and appears early in life. Researchers have identified different temperamental traits, such as reactivity and self-regulation, which can influence a person's adult personality.