If we havent had the need for our appendix for a very long time, why havent we evolved to not have it anymore?

Question: If we havent had the need for our appendix for a very long time, why havent we evolved to not have it anymore?
- Keywords:
  appendix
Asked by fatlouietwin to Damien, Rachael, Simon, Suzi, Tim on 18 Jun 2011.
- Suzi Gage answered on 18 Jun 2011:
  
  Hi @fatlouietwin
  Great question!
  I think the answer is that unless it would have been an evolutionary advantage to NOT have it, then there’s no reason that getting rid of it would have been selected for.
  
  Hope this answers your question 🙂

Question: If we havent had the need for our appendix for a very long time, why havent we evolved to not have it anymore?