instruction:
In this task, you are given a question and a corresponding answer. Your task is to generate a fact statement that is useful in answering the given question.
question:
Question: Dead organisms are the source of what for decomposers? Answer: nutriment.
answer:
dead organisms are the source of nutrients for decomposers


question:
Question: Obstacles that might impede a dune are? Answer: cacti.
answer:
sand dunes are made of sand


question:
Question: In what way are valleys formed? Answer: the passage of water in a straight or winding path moving consistently.
answer:

a valley is formed by a river flowing