Sixteen-year-old alex got his hair trimmed shorter than he wanted, and he is very upset and can't stop thinking about his hair. he tells himself that everyone in school is going to notice how ugly his hair looks. this example illustrates adolescents' belief in:

an imaginary audience

Explanation:

An imaginary audience -

It is the state of mind when the person believes and imagines about the people listening or watcher him or her , is known as the stage of imaginary audience .

The stage is very much common among the young teens and adults , people at this stage are very much active about imagination .

Hence , from the question , the Alex , imagine a lot about his new hair cut and overthink how others would react to his new hair style .

the branch of biology that deals with the normal functions of living organisms and their parts.

the way in which a living organism or bodily part functions.