What does the field of anatomy primarily focus on?

The field of anatomy primarily focuses on the structure of the body, which encompasses the organization and arrangement of various parts and systems within living organisms. This includes studying the physical structures such as organs, tissues, and cells, as well as their relationships to one another. Anatomy provides a foundation for understanding how these structures interact to form functioning systems, and it is essential for fields such as medicine, biology, and health sciences.

In contrast, the other options pertain to different scientific fields. The functions of organisms relate to physiology, which examines how biological systems work and respond. Chemical changes in substances pertain to biochemistry, focusing on the chemical processes within and related to living organisms. Energy transfer in cells relates to cellular biology and bioenergetics, which delve into metabolic processes and how cells obtain and use energy. Each of these areas is crucial for a holistic understanding of biology, but they are distinct from the core study of anatomy, which is specifically centered on structure.