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: the platypus reproduces by laying eggs. 
Question: what reproduces by laying eggs?
platypus.

Fact: crocodiles have good eyesight and a keen sense of smell. 
Question: What has good eyesight and a keen sense of smell?
crocodiles.

Fact: Limestone is formed by deposition. 
Question: Which rock is formed by deposition?

Limestone.