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: No lungs do fish have short esophaguses. Question: Why do fish have short esophaguses?
answer:
no lungs


question:
Sentence: Calculations are described showing conversions between molar mass and density for gases. Question: Calculations are described showing conversions between molar mass and what for gases?
answer:
density


question:
Sentence: Induced or spontaneous are the two methods in which mutations arise in dna. Question: What are the two methods in which mutations arise in dna?
answer:

induced or spontaneous