Answer Adolescence into adulthood encompasses key developmental milestones, including the completion of puberty, which marks significant physical changes, the formation of a stable identity, which involves exploring and solidifying personal values and goals. In order to fully understand this stage of development, describe the major milestones of physical, psychological, and social development of adolescence into adulthood. Provide examples. Include scholarly references (last 5 years) with DOI or a link. Include in paragraph Citation.