Final answer:
Peer groups have a significant impact on an adolescent's behavior. Peer groups play a significant role in shaping an adolescent's identity, values, and behaviors.
Step-by-step explanation:
The development of adolescents is influenced by various factors, including early/late maturity. Developmentalists suggest that besides early/late maturity, peer groups might be more pertinent in determining an adolescent's behavior. Peer groups play a significant role in shaping an adolescent's identity, values, and behaviors. Adolescents often seek acceptance and conformity with their peers, which can strongly influence their behavior and decision-making.