Which activity is a primary responsibility of political parties at the national level

What was the 1787 constitutional convention? !

Which group was responsible for determining the borders of african colonies and later countries

President of the united states has scheduled a cabinet meeting today to discuss energy policy with specific focus on pollution and global warming. given what you know of the executive branch, which group of attendees would the president most likely expect to provide up-to-date information and expert insight during this meeting?