Human variation refers to the differences in physical and genetic traits among individuals within the Homo sapiens species. These variations can include characteristics such as skin color, hair type, eye shape, and height. Factors influencing these differences include genetics, environment, and lifestyle, which contribute to the diverse appearances and abilities seen in human populations around the world. Additionally, human variation is important for understanding how populations adapt to different environments. For example, people living in high-altitude areas may develop larger lung capacities, while those in sunny regions may have darker skin to protect against ultraviolet radiation. Studying these variations helps scientists learn about human evolution and health.