Can someone please help i need to finish this to be able to take my test and do an essay only 2,4,5, and 8

Why did some states believe they had the power to overturn federal laws?

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

Full-service brokerage firms a. have lower commissions. c. provide no investment advice. b. offer portfolio management. d. teach you how to do market research.