I need the eplaination for Question 3: Which of the following best explains the underlying cause of the Spanish actions described by Las Casas? I know the answer but why is it racism?

American troops were worried about cantracting in cuba a. yellow fever b. hepatitis c. polio

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

How did geography impact the development of the early russia?