Why do we humans have to constantly improve our work tools?

Which of the following scenarios illustrates the cultural impact of expanded regional trade for postclassical civilizations? o a. the byzantine empire rises in place of the roman empire. o b. an islamic scholar attends a university in his hometown. o c. internal disputes weaken a large african empire. o d. an arabian sultan wears a robe made from chinese silk.

What event caused south carolina to secede from union in 1860

What is the most necessary information that happened in the titanic movie