Physics is the study of which of the following?

Physics is fundamentally concerned with the interactions between matter and energy, which it explores through the concepts of forces and motion. This discipline investigates how objects move and interact with one another, the nature of energy in its various forms, and the fundamental laws that govern these processes.

For instance, physics looks at how an object in motion remains in motion unless acted upon by a force (Newton's first law), how energy transforms from one form to another (like potential energy converting to kinetic energy), and the effects of gravity on objects. The principles derived from these studies form the foundation for many scientific advancements and technologies.

The other choices focus on different areas of study: the properties of matter pertain more to chemistry, the structure of Earth's interior relates to geology, and the behavior of living organisms falls under biology. Each of these fields has its own specialized focus and methodologies, which distinguish them from the broader interactions studied in physics.