Discuss the spread of maize as a staple crop

Discuss the spread of maize as a staple crop
What was the main cause of the exposed land bridge connecting Eurasia to
North America?
(A) Extended periods of drought during the last Ice Age lowered ocean
levels.
(B) Plate tectonics temporarily led to a rise in the ocean floor within the
Bering Sea.
(C) Much of the water in the oceans congealed into vast glacial packs.
(D) Increased snowfall on land during the last Ice Age lowered ocean
levels.
(E) The shift of Eurasian and North American Plates briefly connected
the two continents.
2. Which theory best describes the spread of maize as a staple crop through
the Native American populations?
(A) Maize was first developed upon the Siberian Steppes and carried to
the Americas via the land bridge.
(B) Maize was developed in South America and slowly spread throughout
the rest of the Americas via pre-Columbian trade routes.
(C) Maize was developed by the nomadic tribes of North America but
was first grown intensively as a staple crop by Native American
groups in Central and South America.
(D) The cultivation of maize occurred separately in isolated pockets
throughout the two continents.
(E) Maize was first developed in the region that is now Mexico and
spread through the Americas in a slow and uneven process
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