In the 1880's, how were various European nations able to begin expanding into Africa and eventually gain control over most of the continent?

Europeans had better technology

Africans lacked tribal unity

all of the above

the development of quinine helped fight African diseases

Discuss the ways in which the northern and southern economies and social customs differed in the decade prior to the civil war. why are they characterized as having “two distinct societies”?

Why was control of the atlantic ocean essential to great britain’s success in world war 2

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