Are there any bacteria in the human intestines that produce oxygen?

Question

Are there any bacteria in the human intestines that produce oxygen?

Answer 1

No bacteria produces oxygen.  The only natural source of O2 is green plants through photosynthesis.

Answer 2

maybe other gases instead eh?  :)

Answer 3

- E Coli - check out link: http://www.jyi.org/volumes/volume6/issue...

"All enteric bacteria can ferment glucose to produce acid and gas. E. coli, specifically, is physiologically versatile. Under anaerobic conditions it can grow by fermentation or anaerobic respiration. This allows E. coli to adapt to both the anaerobic environment inside the intestine and external aerobic environments."