Final answer:
In the options presented, Algae, Fungi, Nematoda, Platyhelminthes, and Protozoans all have eukaryotic cells characterized by a nucleus, while Archaea and Bacteria are prokaryotic and lack a nucleus. Viruses are not cells and lack a eukaryotic structure.
Step-by-step explanation:
Cells are broadly categorized into prokaryotic and eukaryotic. The distinction is based on whether the cells have a nucleus (eukaryotic) or not (prokaryotic). In the given options, Algae, Fungi, Nematoda (which are part of the helminths group), Platyhelminthes (also helminths), and Protozoans all have eukaryotic cell types.
These organisms have complex cell structures that include a defined nucleus. On the other hand, Archaea and Bacteria are prokaryotes and do not have a nucleus. Viruses, despite not being cells, do not have a eukaryotic structure as they lack cellular organization entirely.