Final answer:
The internal variable that affects health status, beliefs, or practices is genetics. It is an inherited factor that influences individual health attributes and potential health issues.
Step-by-step explanation:
The internal variable affecting health status, beliefs, or practices is D) Genetics. Unlike external factors such as family dynamics, socioeconomic status, and cultural background, genetics are inherited from our biological parents and can determine various aspects of our health, including susceptibility to certain diseases, physiological traits, and potential health challenges. Health is also influenced by lifestyle choices, resources, and environmental factors, all of which interact with our genetic makeup to manifest in unique health outcomes for each individual.