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: moving people across bodies of water can be done by flying through clouds. 
Question: moving people across bodies of water can be done by what?
flying through clouds.

Fact: memory cells help keep people from getting sick. 
Question: What helps keep people from getting sick?
Memory cells.

Fact: Force acting against motion causes an object to lose energy. 
Question: Force acting against motion causes what?

Object to lose energy.