Why might scientists need to use human cells in a lab?

Why might congress have had difficulty paying the war debt after the american revolution

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

Uuttuvu v uutc . cuyumlu 6. which has most weakened guatemala's economy? art 1 foreign debt built up in the 1980s ns evidence of continuing rights violations more than three decades of civil war extremely high levels of poverty