Both Thomas Edison and Andrew Carnegie worked as telegraph operators. That meant they had to learn .

pasteurization

to use arc lights

radio frequencies

Morse Code

What city of ancient russia was heavily influenced by the byzantine merchants?

What governments allow the use of the initiative, the referendum, and the recall? a. all state governments and the federal government b. some state governments and the federal government c. some state governments d. all state governments

Why were the chang and xi rivers important to china’s development? a. they keep invaders out. c. they kept china isolated. b. they provided a route for ships to travel inland. d. they provided boundaries for the different political sections