Archaebacteria can survive under extreme conditions because of:

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Presence of proteins homologous to eukaryotic core histones.

Formation of endospore

Cell membrane which is a unit membrane

Due to complex cell wall and cell membrane in them

answer is C.

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Detailed Solution

Archaebacteria differ from other bacteria in having a different cell wall structure and this feature is responsible for their survival in extreme conditions. Their cell wall is not made up of peptidoglycan like that of eubacteria. Their cell wall is made up of complex polysaccharides and complex polypeptide. Their cell membrane is not a unit membrane, while in eubacteria the cell membrane is unit membrane . Cell membrane of archaebacteria is highly complex because of branched lipid chain.

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