The two correct responses for sustainable farming techniques are:
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Planting trees in between rows of crops - This practice, known as agroforestry, helps improve biodiversity, soil health, and can provide additional income sources.
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Rotating crops each year - Crop rotation enhances soil fertility, reduces pest and disease problems, and can improve overall crop yields sustainably.
The other options, such as limiting agriculture to rural areas, planting a single crop over a large area (monoculture), and tilling soil frequently, are generally not considered sustainable practices.