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.
Top definition. Miscegenation. Miscegenation comes from the Latin miscere, to mix, and genus, race; therefore means to mix races resulting in a hybrid offspring. Miscegenation is and will always be a taboo. #evolution#science#genetics#race mixing#taboo. by OneBadAsp November 05, 2006.