Final answer:
The impulsivity and emotional behavior of thirteen-year-old Jonathon may be due to the ongoing development of his frontal lobes, which are responsible for judgment and impulse control.
Step-by-step explanation:
Thirteen-year-old Jonathon's impulsivity and emotional behavior may be due to increased activity and growth in the frontal region of his brain. The frontal lobes, responsible for judgment, impulse control, and planning, are still developing during adolescence. This ongoing development can lead to increased risk-taking behaviors and emotional outbursts in teenagers.