How did the death of archduke franz ferdinand instigate the collapse of peace in europe?

Who was a leader of the soviet union. a) winston churchill b) fidel castro c) harry truman d) mikhail gorbachev

How did german physicist werner heisenberg's uncertainty principle shake beliefs in newtonian physics?

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?