What field of study involves the development and design of products that undergo chemical and biological changes?

The field of study that involves the development and design of products undergoing chemical and biological changes is Chemical Engineering. This discipline encompasses the application of chemistry, physics, mathematics, biology, and economics to efficiently use, produce, design, transport, and transform energy and materials. Chemical engineers work on processes that involve reactions and transformations at a chemical level, making them integral in the development of various products, including fuels, medications, and materials that can undergo these biochemical changes.

While biochemistry focuses specifically on the chemical processes and substances occurring in living organisms and pharmacology studies the effects of drugs and their mechanisms, chemical engineering covers a broader spectrum that includes the design and optimization of industrial processes that may include these biochemical interactions. Environmental Science investigates the interaction of physical, chemical, and biological components of the environment, but it does not specifically focus on product development. Thus, Chemical Engineering is the most suitable answer, as it directly addresses the design and production processes involving chemical and biological changes.