instruction:
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: Fuligo septica causes a fungus on rotting compost. 
Question: What does fuligo septica create?
answer:
Fungus.


question:
Fact: a camera records light. 
Question: What records light?
answer:
a camera.


question:
Fact: birds commonly undergo a type of movement that changes population size. 
Question: What commonly undergoes a type of movement that changes population size?
answer:

birds.