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.

[EX Q]: Question: Bears hibernate in winter because? Answer: the environment is colder and has less food.
[EX A]: seasonal changes are made in response to changes in the environment

[EX Q]: Question: Jackrabbits' hind legs are? Answer: elongated.
[EX A]: long ears are used for releasing heat by a jackrabbit

[EX Q]: Question: Lucy came in from the cold and can's stop shivering. It might help her to sit near? Answer: a running boiler.
[EX A]:
a hot substance is a source of heat