This brought an end to the great west african empires.

a. an increase in countries producing their own goods and not needing to trade

b. the arrival of christianity and the decline of islam

c. enemy nations using sophisticated warfare to overpower the outdated tactics of the empire

d. emperors being unable to further the development of technology and learning

Which of the following describes research that would be considered basic science? a. a farmer is trying to improve his crop yields by using a new kind of fertilizer. b. a college students is curious about the growth of desert pants in the presence of excess amounts of water. c. government officials are trying to prevent the spread of new strain of influenza virus. d. a doctor is trying to determine why a patient is feeling tried and sick.b.a college students is curious about the growth of desert pants in the presence of excess amount of water