Domains are classified by scientist Carl Woese on the basis of presence of nucleus in cells, their ability to make food, and the number of cells in organism bodies.
Domain is defined as the highest taxonomic rank in the hierarchical biological classification system, above the kingdom level. There are three domains of life namely the Archaea, the Eucarya and the Bacteria.
Archea do not have a nucleus whereas Eubacteria have a non-enveloped nucleus and Eukarya have enveloped nucleus.
For more details regarding taxonomic domain refer:
https://brainly.com/question/21362224
#SPJ1