In a closed primary you can only vote for someone in your registered party. In an open primary anyone can vote for any candidate in either party regardless of whether they are registered democrat or republican
Hope this helps :)
The intent for the separation of powers is to prevent the concentration of power and provide for checks and balances.
(The lack of food) hope this helps :/
By creating monopolies and establishing trusts, helped american industrial leaders accumulate wealth during the late 1800s.