The two correct answers that represent sustainable farming techniques are:
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Planting trees in between rows of crops - This practice, known as agroforestry, can enhance biodiversity, improve soil health, and reduce erosion.
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Rotating crops each year - Crop rotation helps maintain soil fertility, reduce pest and disease problems, and improve crop yields.
The other options (planting a single crop, limiting agriculture to rural areas, and tilling soil frequently) are not considered sustainable practices.