Final answer:
Anatomy and physiology are the two main areas of natural science that dictate all physiological processes in the human body.
Step-by-step explanation:
The main areas of natural science that dictate all physiological processes in the human body are anatomy and physiology.
Anatomy is the study of the structures of the body, while physiology is the study of how these structures function and work together to support life. Understanding the structure (anatomy) is crucial for studying the function (physiology) because form and function are closely related in living things.