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.

[EX Q]: Sentence: Estradiol causes the endometrium to thicken during a menstrual cycle. Question: What causes the endometrium to thicken during a menstrual cycle?
[EX A]: estradiol

[EX Q]: Sentence: A solution forms when one substance dissolves into another. Question: What forms when one substance dissolves into another?
[EX A]: solution

[EX Q]: Sentence: Poetically speaking, nature reserves are islands of what, in a sea of habitat degraded by human activity? Question: Poetically speaking, nature reserves are islands of what, in a sea of habitat degraded by human activity?
[EX A]:
biodiversity