Sawmills depend on what type of agriculture for their products?

Sawmills primarily rely on forestry for their products. Forestry involves the management and cultivation of forests, which includes the planting, growing, and harvesting of trees specifically for wood production. This timber is then processed in sawmills to create various wood products, such as lumber for construction, furniture, and other uses.

The process starts with sustainable practices that ensure forests are managed responsibly, allowing for a continuous supply of raw materials. The trees harvested in forestry operations provide the essential materials that sawmills transform into finished wood products. Therefore, the connection between sawmills and forestry is crucial and direct, making forestry the correct answer in this context.