Which branch of biology focuses on the structure and form of organisms?

The branch of biology that focuses on the structure and form of organisms is anatomy. Anatomy involves the study of the physical structure of organisms, including their organs, tissues, and systems. It provides insights into how these structures function and interact, which is crucial for understanding overall organism health and functionality.

Anatomy can be further divided into various subdisciplines, such as gross anatomy, which examines large structures visible to the naked eye, and microscopic anatomy, which explores structures at the cellular level. By studying anatomy, scientists and medical professionals are better equipped to understand disease processes, developmental biology, and evolutionary relationships among different species.

The other options represent different areas of biological study. Ecology focuses on the interactions between organisms and their environments, genetics deals with heredity and the variation of traits, and physiology examines the functions and processes of living organisms. While these fields are all important in biology, they do not primarily focus on the structural aspects that anatomy investigates.