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: What has a positive impact on a bodies strength? Answer: pumping iron.
answer:
exercise has a positive impact on a body 's strength


question:
Question: An example of migration is? Answer: when flocks relocate.
answer:
An example of migration is birds flying south in the winter


question:
Question: The field a farmer plants with varied crops over the years is richer than? Answer: a field where only grain is planted.
answer:

crop rotation has a positive impact on soil quality