Today, in countries where arranged marriages used to be the norm, it is more common for the children to marry only when they themselves accept their parents' choice. Unions like these are called .

Prokaryotic and eukaryotic cells are different in many ways other than the presence or absence of a nucleus. if both archaebacteria and eubacteria are prokaryotic cells, then why are archaebacteria more closely related to eukaryotic cells than they are to eubacteria?