Can someone please help me? thank you and no links

Marx and engels believed that a communist revolution would defeat capitalism and that the revolution would be led by

What is zinn's approach to the study of history? what does he suggest occurs when history is told is the story of human progress?

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