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A population is living off a secure subsistence base, eating plants and animals caught by hunting, fishing, and gathering. The population expands, and as it does, it puts pressure on the resource base, forcing people to eat "third-choice" foods, especially grains. They discovered that the grain responded to human efforts to increase yields, and came to rely increasingly on it. This scenario would fit best with which of the following theories of agricultural development?
Diarrhea
A condition characterized by the frequent passage of loose or watery stools.
Nausea
A feeling of sickness with an inclination to vomit, which can be a symptom of various conditions.
Appetite Cravings
Intense desires for specific foods or types of food, often unrelated to hunger.
Headache
A common condition that involves pain or discomfort in the head, scalp, or neck.
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