Supplement. Archaea or archaebacteria evolved separately from eubacteria and eukaryotes. They are similar with eubacteria in being prokaryotes and lacking distinct cell nucleus. They differ in terms of ribosomal structure, the possession of introns (in some species) and in membrane structure or composition.rchaea or archaebacteria evolved separately from eubacteria and eukaryotes. They are similar with eubacteria in being prokaryotes and lacking distinct cell nucleus.
Definition of COGENCY. : the quality or state of being cogent.See cogency defined for kids. ADVERTISEMENT.efinition of COGENCY. : the quality or state of being cogent.
Definitions for cognateËkÉg neÉªt. blood relation, blood relative, cognate, sib(noun) one related by blood or origin; especially on sharing an ancestor with another. cognate, cognate word(adj) a word is cognate with another if both derive from the same word in an ancestral language. connate, cognate(adj)