Which of the following was one of emperor shihuangdi s accomplishments? a. he drove the invading huns back to the north. b. he opened a trade route with the europeans. c. he created a standard monetary system. d. he united all of ancient china s city-states for the first time.\

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