instruction:
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.
question:
Sentence: Exotic species are also called invasive species because they threaten other species. Question: Why are exotic species also called invasive species?
answer:
threaten other species

question:
Sentence: Blood enters the heart in atria valve. Question: Blood enters the heart in what valve?
answer:
atria

question:
Sentence: Darwin believed in gradualism. Question: Did darwin believe in punctuated equilibrium or gradualism?
answer:
gradualism