Which regulatory body is involved in the approval of seed treatment chemicals?

The Environmental Protection Agency (EPA) is responsible for the approval of seed treatment chemicals. This regulatory body evaluates the safety, efficacy, and environmental impact of pesticides and related chemical products before they can be used commercially. The EPA's comprehensive review process ensures that any chemical used in seed treatments meets strict standards to protect human health and the environment.

While the FDA oversees food safety and related matters, its jurisdiction does not extend to the approval of agricultural chemicals. The USDA plays a significant role in agriculture policy and programs, but it does not primarily handle the registration or evaluation of seed treatment chemicals. The NIH focuses on health research and does not have a regulatory role in agricultural chemicals. Thus, the EPA is the correct answer as it specifically governs the marketing and application of pesticides and other agricultural chemicals.