Wheat, rice, and maize are lacking in one essential amino acid. The ancient people who domesticated these crops:

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Quizplus · Accepted Answer

The ancient people who domesticated wheat, rice, and maize also domesticated other foods that made up for the lack in lysine. For example, in South America, maize was often paired with beans, which are rich in lysine. This ensured that the people consuming these crops still received an adequate amount of essential amino acids.

Wheat, Rice, and Maize Are Lacking in One Essential Amino