Final answer:
Personality is shaped by both genetic and environmental factors.
Step-by-step explanation:
Psychologists who study personality believe that it is shaped by both genetic and environmental factors. They argue that personality is a combination of genetics and environment. This means that while some aspects of our personality may be influenced by our genetic makeup, others are influenced by the environment and culture we are raised in. For example, our temperament, which is our inborn, genetically-based personality differences, has a biological basis. However, environmental factors, such as family interactions, can also affect how our personality traits are expressed.