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in the early nineteenth century, the united states became involved in the building of the panama canal. use the words below to match each american with his particular accomplishment he was the chief engineer who realized the panama canal required a series of locks between the two oceans.

Which reason best explains why certain areas of southwest asia have low population density? a. the semi-arid climate makes farming difficult because it produces very little rainfall. b. the moist climate limits job opportunities because it reduces oil production. c. the semi-arid climate produces heavy rainfall that contributes to devastating floods. d. the moist climate reduces agricultural production by causing water shortages.