According to the Changle Inscription what appears to be an important purpose of the voyages?

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 is the main social system that existed in ancient china?

*history * who was clyde ross and how was he impacted by housing discrimination?