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: Fresh water biomes are defined by low salt concentration. Question: What are fresh water biomes defined by?
[A]: low salt concentration


[Q]: Sentence: Meteorites are often comprised of remnants of the earliest material that formed in the solar system. Question: What astronomical phenomenon is often comprised of remnants of the earliest material that formed in the solar system?
[A]: meteorites


[Q]: Sentence: Four many different types of stresses are there. Question: How many different types of stresses are there?
[A]:
four