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: bottom dwelling organisms can be filter feeders. 
Question: What can bottom dwelling organisms be?
answer:
filter feeders.


question:
Fact: Some parasites survive on the surface of their host. 
Question: Where so parasites go to survive?
answer:
on a host.


question:
Fact: When a hemisphere is tilted away from the sun, that hemisphere receives less photons. 
Question: What does a hemisphere receive less of if it is tilted away from the sun?
answer:

photons.