Which of the following scenarios bestillustrates the phenomenon of oceans acting as barriers rather than highways?

A. Chinese and Japanese foods are popular in the United States.

B. Different native plants developed in different hemispheres.

C. Manufacturers in the United States buy parts from Asia.

D. Religions that began in the Middle East spread around the world.

Extensive and unusual cold snaps have occurred here recently. is this evidence that global warming is lessening or not occurring? no—although the long-term trend is for warming, short-term weather patterns can still be variable. no—melting of glaciers and ice caps is making the oceans cooler, which can cause cold snaps. yes-- if global warming really were occurring, cold snaps wouldn’t happen. yes—due to global warming, weather patterns should be become less—not more—variable.