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: Two felled trees, split in twain, with the same number of rings, means they're the same? Answer: age.
answer:
a tree growing a tree-growth ring occurs once per year

question:
Question: Earth orbiting what causes seasons to change? Answer: local star.
answer:
Earth orbiting the Sun causes seasons to change

question:
Question: Some animals use rocks as a means of what when there is bad weather? Answer: safeguarding themselves.
answer:
rocks are a source of shelter for small animals in an environment