In an experimental investigation, the variable that the researcher changes or manipulates in order to see its effects is called the variable.

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

Pl ! the term laissez-faire refers to the government’s approach, in the 1890s, to foreign policy affecting trade. economic policy affecting business. educational policy affecting schools. domestic policy affecting social reform.

What would be considered a secondary source about the assasination of abraham lincoln