Past means -ed. Present means am, is, are and -ing. Future means not yet happened
Answer:
Traders moved their goods across the Sahara in large groups called caravans. Camels were the main mode of transportation and were used to carry goods and people. Sometimes slaves carried goods as well. Large caravans were important because they offered protection from bandits.
Explanation: HOPE THIS HELPS<3
Whereas the first prison of this type in the U.S. was Alcatraz, which was opened in 1934, it still wasn't called supermax prison. The first officially recognized supermax prison (i.e. prison with maximum security) was established in 1984 in Marion, after two inmates of Federal Penitentiary killed two guards. That prison was transformed into a supermax facility, which was followed by dozens of other prisons throughout the States.