Anaerobic prokaryotes use to obtain energy. archaea and eubacteria are prokaryotic in nature. one of the differentiating characteristics between them is that eubacteria have in their cell walls.

The correct answer would be fermentation and peptidoglycan.

Explanation:

Anaerobic prokaryotes perform fermentation to get energy. Fermentation can be defined as a metabolic process, which includes the breaking of large organic molecules into simple molecules in the absence of oxygen.  

Thus, the correct answer is fermentation.

The cell wall of archaebacteria is build of polysaccharides and proteins whereas the cell wall of eubacteria is made up of peptidoglycan molecules. Peptidoglycan is not present in the cell walls of archaea.

Thus, the correct answer is 'peptidoglycan.'

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