article_snippet: Scientists believe Scientists have got to the bottom of anal evolution.
article_snippet: A team of Norwegian researchers has identified two sets of genes that cause some creatures to have a fully-functioning anus, while other only have 'transient' ones.
article_snippet: While several organ systems have been investigated, such as the nervous system, the anal opening has been largely neglected,' Biologist
article_snippet: The study, published in the journal Zoologischer Anzeiger, identified genes known as brachyury and ParaHox, that are crucial to the development of an anus.
article_snippet: According to a report by Matt Walker at BBC Earth, Study reveals how the anus is perhaps one of the most important organs in our body, helping our digestive system work.
article_snippet: Some animals have simpler versions, in others the organ appears to be transient, while another has multifunctional anuses.
article_snippet: Animals that do have an anus, however, often grow to be larger, more sophisticated creatures.
article_snippet: A team of Norwegian researchers has identified two sets of genes that cause some creatures to have a fully-functioning anus, while other only have 'transient' ones .
article_snippet: In 2013, researchers discovered that one of our earliest ancestors was a worm with no anus.
article_snippet: Trying to understand when and why the anus evolved is also complicated because the anus also appears and vanishes again within various groups of animals, such as flatworms.
article_snippet: The team are now conducting further research into whether the anus has evolved independently a number of times among animals. '
article_snippet: The pattern of presence and absence of the anus in animals is quite fascinating,' Dr Hejnol told the BBC.
highlights_snippet: Brachyury and ParaHox genes could shed light on anus evolution .
  
highlights_snippet: Brachyury and ParaHox genes may indicate why some creatures only have a 'transient' anus .
  