What nucleus is removed from a body cell of one organism and is palced in an egg cell that has had its nucleus removed?
potentially a very broad question: all plants and animals possess cells with a nucleus, but the VAST majority of these are multicellular organisms so you probably wouldn't describe the whole organism as having a single nucleus. One example of a single celled organism that contains just one nucleus is yeast
There are numerous unicellular organisms in the biosphere. In which some of them are prokaryotes and some of them are eukaryotes. It can be differentiated based on the nucleus. If the nucleus is surrounded by nuclear membrane, such organisms are called eukaryotes (Eu=True; Karyon=Nucleus). Whereas, if the nucleus (genetic material like DNA) is not surrounded by the nuclear membrane is called prokaryotes (Pro=primitive; Karyon= Nucleus)