Final answer:
Cells are classified into two broad categories, prokaryotic and eukaryotic, with prokaryotic cells belonging to Bacteria and Archaea domains and lacking a true nucleus, while eukaryotic cells, including those of animals, plants, fungi, and protists, have a defined nucleus and organelles.
Step-by-step explanation:
Cells are fundamental units of life that can be grouped into two main categories: prokaryotic and eukaryotic. The domains Bacteria and Archaea consist of prokaryotic cells, which lack a true nucleus and organelles enclosed by membranes. In contrast, eukaryotic cells, which include animal, plant, fungi, and protist cells, possess a defined nucleus and membrane-bound organelles. Thus, when considering the classification of cells into broad categories, the essential distinction lies in whether they are prokaryotic or eukaryotic, not necessarily in whether they are plant, animal, bacteria, or archaea.