Rock & roll: a)None of these choices are correct
b)was mostly popular with white collar adults
c)blended country, heavy metal, and alternative music to create a new sound
d) helped create a generation gap between teens and their parents

the growing interconnectedness of the world through communication, trade, and the exchange of ideas is an important theme in the history of the 20th and 21st centuries.

explanation:

a. "how old man winter was driven back” and “ormuzd and arimanes"

b europeans take corn to africa. corn becomes an important crop there.