Someone help me please

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

What was one major cause of worldwide conflict during the first decade of the 21st century?

Which of these is not a purpose of the constitution as explained in the preamble? • to make a better country • to keep states more powerful the the u.s. • to keep peace in the country • to protect freedom