Jeremy is trying to save money for college. he saves half of the money he earns from his part-time job. he has set a goal to save enough money to pay for his dorm fees for his first year. these behaviors demonstrate that jeremy's cortex has matured.

prefrontal cortex

Explanation:

According to my research on studies conducted by various psychologists, I can say that based on the information provided within the question Jeremy's prefrontal cortex has matured. The prefrontal cortex is a part of the brain which is located in front of the frontal lobe. Its main function includes managing complex behaviors, including planning, and greatly contributing to personality development.

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