Human biology is the study of the structure, function, and processes of the human body. It encompasses various systems, including the nervous system, circulatory system, and digestive system, each working together to maintain health and support life. Understanding these systems helps us learn how the body responds to different conditions and environments. Additionally, human biology explores the genetic and cellular basis of life. DNA carries the genetic information that determines traits and influences health. Cells, the basic units of life, perform essential functions, such as energy production and waste removal, ensuring the body operates efficiently.