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: You can navigate through the Pacific with a compass. 
Question: What can you use to navigate the Pacific?
compass.

Fact: Telephones are used for communication by transmitting audible waves. 
Question: Telephones are used for communication by transmitting what?
audible waves.

Fact: feathers have evolved from reptile scales of bipedal dinosaurs called theropods. 
Question: what have evolved from reptile scales of bipedal dinosaurs called theropods?

feathers.