In 1435, the Ming emperor changed the policy of Chinese Zheng He's overseas exploration by A. sending him to explore and trade in the Americas. B ending the building of seagoing ships and halting expeditions. C. ordering Zheng He to invade Japan. D. inviting Mongolians to rule China.

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

Explain when conformity is beneficial and when it is harmful. give examples of both?

He table below shows the number of immigrants to the united states from different regions of europe between 1871 and 1910