Write a correct answer to the given question based on its associated fact. Make sure that your answer is contained in the associated fact. Don't be creative and introduce any new word that is not mentioned in the associated fact! Remember that the associated fact has been rearranged to form the question. So, the correct answer words must lie within the associated fact. The correct answer can be a word, phrase, or even a sentence.

Fact: cloning is the process of isolating and making copies of a unit of heredity. 
Question: What is the process of isolating and making copies of a unit of heredity?
cloning.

Fact: An automobile engine works by summing kinetic energy and potential energy. 
Question: What works by summing kinetic energy and potential energy?
an automobile engine.

Fact: Thirst is used to make a cow realize that it needs to replenish its bodily water by the body. 
Question: Thirst is used to make a cow realize that it needs to replenish its bodily what by the body?

water.