In prokaryotes, multiple electron acceptors can be used in anaerobic respiration. These include nitrate
Nitrate ...
One view of the Phylogeny of Life on Earth (at the University of California at Berkeley's Museum of Paleontology) highlights the role of archeabacteria among prokaryotes -- as a separate Archaea "domain" apart from Eubacteria -- in the development of ...
Bacteria comprise a major domain of life called prokaryotes. In contrast, the cells in eukaryotes have a well-defined nucleus; eukarya include molds, plants, and animals.
The new class of prokaryotes evolved to include cyanobacteria, the primary oxygen-generators on the planet.
As early prokaryotes began to approach the surface of the ancient oceans, before the protective ozone layer had formed, blocking out most wavelengths of UV light, they almost invariably died out.
 See also: Energy, Ocean, Earth, Molecule, Time
  
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