text: There are two factors to understand difference and similarities in humans. First is HEREDITY, every person inherited some of his characteristics from the parents, on the ratio of 4:1. This kind of characteristics can never be changed cause it is in the genes that makes you genetically similar to either your father or mother. This characteristics cannot be modified and are observed in the color of eyes; shape of the body, fingers, face; size of chest. Second is ENVIRONMENT, every person is also a product of environmental condition. This characteristics are the ones that can be modified externally. The color of your skin may change thru climatic condition, surgery, intake of chlorinated water; color of hair can change by exposure to salt water in the shore at all times, dye and etc.