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: Birds give birth to their babies while still in an egg. Mammals, however, give birth to their babies? Answer: already alive.
[EX A]: mammals give birth to live young

[EX Q]: Question: Two cats in different rooms may share information by? Answer: vocalizing.
[EX A]: sound can be used for communication by animals

[EX Q]: Question: Standing in a canyon and yelling your name? Answer: will cause your name to reverberate thru the canyon.
[EX A]:
echo is when sound reflects off of a surface