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: What is a source of energy for animals? Answer: grains.
[EX A]: food is a source of energy for animals

[EX Q]: Question: What is most likely to occur before a rainstorm? Answer: atmospheric water droplets collide.
[EX A]: precipitation is when water falls from the sky

[EX Q]: Question: Certain countries make it illegal to bring in certain species of animals that breed very fast because that will lead to? Answer: overpopulation.
[EX A]:
if the population of an organism increases then the ecosystem may become overpopulated with that organism