Why did the diet of the first North Americans change about 10,000 years ago?
A) The animals they hunted in Asia did not follow them to North America, so they needed to find new sources of food.
B) North Americans adopted agricultural systems, allowing them to replace meat with vegetables as the main foods in their diet.
C) North Americans were unable to migrate far enough inland to find hunting grounds, so they adapted to the resources available at the coast.
D) Mammoths and other large game disappeared from their habitat, causing North Americans to rely on smaller game, fish, and plant foods to survive.
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