What contributed to the fall of both mali and songhai?

a) competition from the mediterranean states
b) devaluation of gold
c) invasion by the moroccans
d) internal conflicts over succession

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

The byzantine empire weakened after asia minor

What was v-e day? a. victory in england day b. victory in europe day c. victory in japan day d. victory every day