What do integrated farming systems typically combine?

Integrated farming systems are designed to enhance productivity and sustainability by combining different agricultural practices. The correct choice highlights the combination of animal husbandry and crop production. This integration allows for the effective use of resources, as animal waste can serve as a natural fertilizer for crops, while crop residues can be used as feed for livestock. This synergistic relationship helps to improve soil health, increase crop yields, and diversify income for farmers.

The other options represent practices that do not encapsulate the full essence of integrated farming systems. While crops and chemicals can sometimes be a part of farming, they do not reflect the holistic integration of different agricultural components. Forestry and crop production, as well as fishing and irrigation, involve related but distinct practices that might not work together as seamlessly as animal husbandry and crop production do in an integrated system.