why do we have to breathe . wouldnt we be ok without breathing or lungs?(if we were made to not breathe)

Question: why do we have to breathe . wouldnt we be ok without breathing or lungs?(if we were made to not breathe)
- Keywords:
  breathe,
  breathing,
  evolution,
  evolve,
  human body,
  lung
Asked by meganmoult to Audra on 22 Mar 2012.
- Audra Benjamin answered on 22 Mar 2012:
  
  We have lungs and breath to get oxygen to our cells and remove carbon dioxide. If we were less complex creature like worms we could take in oxygen through our skins.

Question: why do we have to breathe . wouldnt we be ok without breathing or lungs?(if we were made to not breathe)