Final answer:
Bacteria are the exception; they do not belong to the domain Eukarya. Instead, they are classified under their own domain, Bacteria, which consists of prokaryotic organisms.
The correct answer is options 1) bacteria.
Step-by-step explanation:
The student's question is asking which of the listed options is not an organism within the domain Eukarya. From the options given, bacteria are the exception since they belong to the domain Bacteria, which consists of prokaryotic cells that do not have a nucleus. In contrast, animals, plants, fungi, and protists are all part of the domain Eukarya, which is characterized by cells with a nucleus and includes both unicellular and multicellular organisms.
The correct answer is options 1) bacteria.