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Describing an organism as "invertebrate" specifically means that it lacks a backbone or spinal column. Invertebrates are a diverse group of animals, and they make up the majority of the animal kingdom, encompassing several classes such as mollusks, arthropods, and cnidarians. This classification distinguishes them from vertebrates, which have a defined spinal column. Understanding this distinction is important in biology as it helps categorize organisms based on their structural features and evolutionary relationships. The other options relate to different characteristics but do not accurately define what an invertebrate is.