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: pie charts are circle graphs. 
Question: Which is a circle graph?

Answer: pie chart.


Question: Fact: breathing is when fish convert from oxygen in water to oxygen in blood. 
Question: When fish convert oxygen in water to oxygen in blood this is called?

Answer: breathing.


Question: Fact: humans can make the bottleneck effect occur in fish. 
Question: What can make the bottleneck effect occur in fish?

Answer:
humans.