Was Pangea the only supercontinent to have existed explain your answer?

No, Pangaea was not the only supercontinent to have existed. Before Pangaea, there were other supercontinents, such as Rodinia and Gondwana, which formed and broke apart over geological time. The process of supercontinent formation and breakup is a recurring cycle in Earth's history, influenced by tectonic plate movements. Thus, while Pangaea is the most well-known supercontinent, it is part of a larger history of supercontinent cycles.