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: DNA strands are called a polynucleotide. 
Question: What is a DNA strand?
answer:
Polynucleotide.


question:
Fact: Experiments are often done in a science facility. 
Question: Experiments are often done where?
answer:
in a science facility.


question:
Fact: gravity causes objects that have mass to be pulled down on Mars. 
Question: Gravity causes what to be pulled down on Mars?
answer:

objects that have mass.