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: Cars damage the environment by causing an excess of contaminants. 
Question: How do cars damage the environment?
answer:
Emitting an excess of contaminants.


question:
Fact: penguins are endothermic tetrapod vertebrates. 
Question: what are endothermic tetrapod vertebrates?
answer:
penguins.


question:
Fact: plants help the body live during the day but not during the night. 
Question: What do plants do during the day but not during the night?
answer:

Help the body to live.