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: Genes are a part of coiled structures made of DNA and proteins. 
Question: What are a part of coiled structures made of DNA and proteins?

Answer: genes.


Question: Fact: Ejaculation of sperm can be inhibited by bacterial infection. 
Question: Bacterial infection can inhibit ejaculation of what?

Answer: sperm.


Question: Fact: greenhouse gas concentrations in the air have increased over the last decade dramatically. 
Question: Concentrations of what have increased over the last decade dramatically?

Answer:
greenhouse gases in the air.