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.

Sentence: The majority of species live in the ocean. Question: Where do the majority of species live?
ocean

Sentence: A binary molecular compound is made up of two  elements. Question: A binary molecular compound is made up of two of what?
elements

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?

mass extinctions