Answer and explanation;
-Scientists choose the kingdom in which a eukaryote belongs by asking questions, such as, Is this organism unicellular or multicellular, autotrophic or heterotrophic and how does the organism reproduce. They may also check the cellular structures to see whether the nucleus and organelles are membrane bound.
-Eukaryotic cells are the cells that have: a membrane-bound nucleus, numerous membrane-bound organelles (including the endoplasmic reticulum, Golgi apparatus, chloroplasts, and mitochondria). This is unlike prokaryotes which lack nucleus and membrane bound organelles.