Answer:
The correct answer is D) "Methanogen".
Step-by-step explanation:
Methanogen is one example of an organism that is not made up of 1 or more eukaryotic cells. Methanogen are a type of organisms that are prokaryotic and belong to the domain of archaea. These organisms produce methane as a byproduct when they are in hypoxic conditions, biological process from which they were given its name.