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.

Fact: living things cannot survive without oxygen. 
Question: what cannot survive without oxygen?
living things.

Fact: Each starfish arm contains part of the water vascular system. 
Question: Where does a starfish have its water vascular system?
in its arms.

Fact: cell division is how plants grow and repair themselves. 
Question: what uses cell division to grow and repair itself?

plants.