Final answer:
Research indicates that temperament remains relatively stable throughout childhood and adolescence but is also influenced by both biological factors and environmental factors such as family interactions.
Step-by-step explanation:
As we look at temperament throughout childhood and adolescence, based on research we could say that temperament remains stable over time. Contemporary psychologists believe temperament has a biological basis, evident very early in life, and is partially shaped by our genetic makeup. However, this does not mean that temperament is entirely fixed. Environmental factors, like family interactions, and maturation can also play significant roles in shaping how children's personalities are expressed.
Thomas and Chess's work identified three main categories of temperament in babies: easy, difficult, or slow to warm up, and their work suggests how these temperaments might interact with parenting styles. Rothbart's research discusses two main dimensions of temperament—reactivity and self-regulation—and how they are integral parts of an adult's personality.