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Question: for several centuries prior to the arrival of european settlers...

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For several centuries prior to the arrival of European settlers, many North American indigenous tribes, including the Iroquois, grew what were called the “three sisters”: maize (corn), climbing beans, and winter squash usually all in the same field at once. (See the photo below.) Tall-growing corn provided carbohydrates, beans climbing on the corn stalks provided protein, and ground-covering squash provided additional vitamins and oils. This polyculture system was very sustainable in that it could be used year after year and caused little harm to site capability and required only modest amounts of labor. Why it was so sustainable? Explain. [2 Marks]

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