Factors affecting differences in individuals
| Genes- inherited from parents | Social- influence of other people | Lifestyle- choice that one makes | Environment- situation & opportunities |
| Genetic inheritance | Family relations | Income | Education experiences |
| Gender twins | Relationships with family and friends | Position, Designation | Pollution |
| Physical appearance | Ethnicity, Religion, Culture | Material possessions | Location of residence |
| Experiences in life | Diet, Exercise, Physical activity | Access to healthcare etc |