Which strategy would a historian most likely use to determine whether a source is valid

Under the article of confederation everyone had to agree so it was hard to get amendments passed true or false

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 the environments in north america affect the development of america indian cultures in the period just before europeans arrived