Here's why:
* Eukarya includes all organisms with cells that have a nucleus and other membrane-bound organelles. This includes animals, plants, fungi, and protists. Most organisms in Eukarya are multicellular, meaning they are composed of many cells working together.
* Bacteria and Archaea are the other two domains of life. They are both prokaryotes, meaning their cells lack a nucleus and other membrane-bound organelles. Most prokaryotes are single-celled organisms.
