The taxonomic group that this organism should be classified in is: bacteria.
Taxonomy can be defined as a scientific method that is typically used by researchers for the naming, classification and description of the various species of organisms such as animals, humans, and plants.
In Science, there are various taxonomic group for organisms and these include:
Organisms classified as bacteria are eukaryotic, unicellular, and autotrophic. Thus, the taxonomic group that this organism should be classified in is bacteria.
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