Once an organism is assigned to a particular taxonomic hierarchy, it is permanent and cannot be revised.

Question

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Taxonomic hierarchies are always subject to revision based on new evidence or changes in our understanding of the relationships among organisms. As new information becomes available, taxonomists may decide to rearrange the hierarchy or reassign organisms to different groups. Therefore, taxonomic classifications are not permanent and are always subject to revision as knowledge and understanding evolve.

Once an Organism Is Assigned to a Particular Taxonomic Hierarchy