What are five advances in 20th century science that you think are the most important

In 1956, people in demanded that soviet troops to be removed as the part of a call for democratic reforms

What best describes the transportation within cities in the early 1800s

Following archduke franz ferdinand's assassination, austro-hungarian leaders: a. aided the ottoman empire in its campaign to keep serbia under its control. b. executed nearly all prominent serbs living in austria-hungary c. threatened to invade serbia if serb leaders did not agree to a set of strict demands. d.. formed an alliance with great britain to protect austria-hungary from future attacks.