Can anyone help. Why are secondary sources important to the study of history? 1.Museums usually contain the majority of these sources.
2.These sources provide information written by other authors.
3.These sources include bones and weapons.

What bodies of water provided the eastern border of the zhou dynasty? ?

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

Which statement is true of both presidential and parliamentary systems of government?