Many scientists believe that the first Paleo-Indians in North America a. arrived between 30,000 and 13,000 years ago
b. became extinct because the climate got too cold.
c. built boats to sail along the coast and trade with North America.
d. used the land bridge between Asia and North America to facilitate trade

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

In what way did expansion and global trade during the 15th to 18th centuries affect the economies of european countries?

What was a challenge for president truman’s political agenda in 1950