Colonial rule in african nations did all of the following, except

a.

created a pattern of economic dependence.

c.

educated africans in democracy.

b.

undermined traditional political systems.

d.

drew artificial boundaries.

Marine exptoration of oil uses seismic waves to locate oil in the seabed. what is a negative impact from seismic waves on the aquatic ecosystem of the ocean? a.seismic waves kill microoganisms b.seismic waves disrupts the sand and causes seafloor erosion c.seismic waves have virtually no adverse affects on marine life d.seismic waves damage the sonar that dolphins and whales use to orient themselves underwater