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: marine and benthic creatures lack respiratory and excretory systems. 
Question: what creatures lack respiratory and excretory systems?
marine and benthic.

Fact: food is irradiated for space travel. 
Question: what food is required for space travel?
irradiated.

Fact: Bulbs require electrical energy to see in darkness. 
Question: Bulbs produce electrical energy to what?

see in darkness.