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: During a prolonged shortage of water, a tree's ability to add extra tissue and grow thick rings is slowed and the tree produces? Answer: thinner growth rings.
answer:
as the amount of available water decreases , tree-growth rings will become narrower


question:
Question: An example of biofuel could be? Answer: leaves.
answer:
biofuel is used to produce electricity by burning


question:
Question: An animal needing to be warmer could? Answer: eat more.
answer:

fat is used to keep animals warm