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.

[EX Q]: Fact: Starfish lack respiratory and excretory systems. 
Question: What is an example of an animal that lacks a respiratory and excretory system?
[EX A]: Starfish.

[EX Q]: Fact: Ink is used for hiding from predators by some animals that eat small crabs. 
Question: Some animals that eat small crabs also use this for hiding from predators:?
[EX A]: ink.

[EX Q]: Fact: energy is lost due to heat. 
Question: what is energy lost to?
[EX A]:
heat.