if we all evolved from the same organism why do we have different facial and bodily features between different races

Question: if we all evolved from the same organism why do we have different facial and bodily features between different races e.g. eye colour, hair , lip sizes etc
- Keywords:
  bodily,
  evolution,
  facial,
  features,
  organism
Asked by anon-181679 on 20 Jun 2018.
- Jason Chu answered on 20 Jun 2018:
  
  Diversity and evolution.
  We all live in different environments, and we adapt to those environments. And the human species have done this over millions of years (~2.5 million).
  Just as an example, if humans lived in a climate with more sun, we tend to have more melanin and so skins are darker.
  The same story will apply for other different features!

Question: if we all evolved from the same organism why do we have different facial and bodily features between different races e.g. eye colour, hair , lip sizes etc