Molly is shy and reserved in social settings. her brother, robert, on the other hand, is outgoing and sociable. molly and robert likely have differing levels of

a. dopamine

Explanation:

This question is incomplete. The options are

a. dopamine

b. serotonin

c. extraversion

d. glutamate

According to the biological approach to personality, our neurotransmitters are responsible for most part of our personality and illnesses. Some researchers have found that people who are outgoing and sociable show an increased production of dopamine while people who are reserved, introverted and shy have low levels of dopamine.

In this example, Molly is shy and reserved in social settings. Her brother, Robert, on the other hand, is outgoing and sociable. From what we said before, we could say that they most likely have differing levels of dopamine.