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, promotes biodiversity, improves soil health, and enhances resilience against climate change.
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Rotating crops each year - Crop rotation helps maintain soil fertility, reduces pest and disease cycles, and can enhance biodiversity.
The other options (planting a single crop over a large area, limiting agriculture to rural areas, and tilling soil frequently) are not considered sustainable practices.