Use the drop-down menu to complete the sentence.

the wealth of east african city-states was based on
a. control of natural resources.
b. farming.
c. trade.
d. gold mining.

! so much!

What method did party bosses use to maintain the power of their political machines?

How are diamonds and graphite the same? how are they different? a. both diamonds and graphite are made entirely out of carbon. they are different because the carbon atoms are arranged differently with a more three-dimensional structure in diamonds and flat layers in graphite. b. both diamonds and graphite have atoms that are arranged with flat layers. they are different because only graphite are made entirely out of carbon. c. both diamonds and graphite have atoms that are arranged with three-dimensional structures. they are different because only diamonds are made entirely out of carbon. d. diamonds and graphite have no similarities. they are different because the carbon atoms are arranged differently with a more three-dimensional structure in diamonds and flat layers in graphite.

Match each model with its name and the name of the scientist who created it.