Body composition describes the relationship of which two components in the human body?

Body composition fundamentally refers to the distribution of different types of tissue in the body, typically expressed in terms of fat mass and fat-free mass. Fat mass includes all the fat tissue in the body, while fat-free mass encompasses everything else, including muscle, bones, organs, and water. Understanding this relationship is crucial for assessing health and fitness, as it provides a clearer picture of an individual's body structure beyond just weight. This distinction is significant for various applications, such as designing fitness programs, assessing health risks, and tracking progress in weight management.

The other options focus on alternative components, such as focusing solely on bone mass or muscle mass, which does not provide the complete picture of body composition that involves the crucial differentiation between fat and fat-free tissues.