article_snippet.sent: ’ contrasting looks can be traced back to The little girls parents.
article_snippet.sent: The little girls also have very different personalities, as well as different skin tones.
article_snippet.sent: The fact that they share a gender is completely down to chance.
highlights_snippet.sent: Girls are non-identical, meaning Girls do not share the same set of DNA .
  
highlights_snippet.sent: This means Girls physical characteristics and genders can vary .
  