A -- B -- C -- D -- E -- F -- G -- H -- I -- J -- K -- L -- M -- N -- O -- P -- Q -- R -- S -- T -- U -- V -- W -- X -- Y -- ZUniversities beginning with U, excluding the words University, Universidad, Université, etc.
... photosynthetic bacteria, many of which do not release oxygen. One significant group of such organism are bacteria which use hydrogen sulfide instead of water in ...