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what should be said.
Definition: Pseudisobrachium is a type of taxonomic classification used in botany and zoology. It describes a species that has two sets of spines, one above the other, on the same part of its body, but without any external structure to distinguish them.
Definition: Isobrachium is a radioactive element that has been found in rocks, such as those from the Neoproterozoic period (about 541 million years ago), and it was first discovered by the German geologist Wilhelm Hahn in 1897. Isobrachium has a high yield of isotopes compared to other elements, making it an important element for studying the early Earth's environment.