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.
--------
Question: Fact: a platypus lacks a uterus. 
Question: What do platypuses not have?

Answer: uterus.


Question: Fact: humans require energy for growth. 
Question: what requires energy for growth?

Answer: humans.


Question: Fact: Flamingos are funny looking, but they actually have a large brain relative to the size of their body. 
Question: Which of these has a large brain relative to the size of their body?

Answer:
flamingo.