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.

Input: Consider Input: Fact: hormones control heart rate. 
Question: What do hormones control?

Output: Heart rate.


Input: Consider Input: Fact: Mutations can be detected by analysis on gene abnormalities. 
Question: Which process of gene abnormalities can mutations be detected?

Output: analysis.


Input: Consider Input: Fact: When plants are covered in sediment layer over time, fossils form. 
Question: What forms when plants are covered in layers of sediment over time?


Output: fossils.