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: A protein-rich fluid leaks into spaces between cells. 
Question: A protein-rich what leaks into spaces between cells?
fluid.

Fact: Damming a river can cause something with fresh water to form. 
Question: What is the thing that is created by damming a river made of?
Fresh water.

Fact: Crustaceans change color to protect themselves against predators. 
Question: Why do crustaceans change color?

To protect from predators.