Final answer:
Paragraphs 15-16 highlight the policy differences and continuities between the Obama and Bush administrations regarding the economy, education, environment, and international affairs, contributing to understanding the challenges faced during Obama's presidency.
Step-by-step explanation:
Paragraphs 15-16 in the provided text focus on how Barack Obama's policies in areas such as the economy, education, and the environment compared to those of his predecessor, George W. Bush. They also tackle the question of the United States' success in achieving its objectives in Iraq and Afghanistan during his administration.
These paragraphs contribute to the development of ideas in the text by highlighting the contrasts and continuities between the Obama and Bush administrations, as well as reflecting on the challenges faced during Obama's presidency in the realms of international conflicts.
Paragraph 15-16 in the text 'Barack Obama Nobel' contribute to the development of ideas by discussing Barack Obama's story and the challenges he faced as president.
These paragraphs mention his multicultural background, absent father, single working mother, and care provided by his maternal grandparents. They also mention the significant challenges he had to manage, including the economic recovery, war on terror, and healthcare reform.