Delaware Barbering Practice Exam

Hygiene is the correct answer because it specifically refers to the science of healthful living, which includes practices and behaviors that promote good health and prevent diseases. Biology, physiology, and anatomy are all related sciences, but they focus on different aspects of the human body and do not solely encompass healthful living. While they may provide some knowledge that can contribute to a person's overall health, they are not specifically dedicated to it like hygiene.