Detailed Instructions: In this task, you are given a sentence and a question, you would be asked to create the answer which is contained in the sentence provided.
Q: Sentence: Most, if not all, of the extant animal phyla today evolved during the cambrian period, yet many of mass extinctions devastating events have taken place since then. Question: Most, if not all, of the extant animal phyla today evolved during the cambrian period, yet many of what devastating events have taken place since then?
A:
mass extinctions