A major practice of sustainable agriculture isGroup of answer choicesan increased "green revolution" use of chemicals.the lack of integration of crops and livestock.use of pesticide resistant seed.limited use of chemicals.agribusiness.

The major practice of sustainable agriculture is the limited use of chemicals.

Step 1: Understand the question - The question is asking about a major practice of sustainable agriculture.

Step 2: Analyze the options - The options given are: an increased "green revolution" use of chemicals, the lack of integration of crops and livestock, use of pesticide resistant seed, limited use of chemicals, and agribusiness.

Step 3: Evaluate the options - Sustainable agriculture is a method of farming that aims to maintain the health of the environment, economic profitability, and social and economic equity. This means that practices that harm the environment, such as the increased use of chemicals, are not part of sustainable agriculture. Similarly, the lack of integration of crops and livestock, and the use of pesticide resistant seed, are not sustainable practices as they do not promote biodiversity and can lead to other environmental problems. Agribusiness, which is the business of agricultural production, is not a practice but a sector.

Step 4: Choose the correct answer - The only option that aligns with the principles of sustainable agriculture is the limited use of chemicals. This practice reduces the impact on the environment and promotes the health of the soil and crops.