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.

[EX Q]: Fact: Vertebrates are all chordates that have a spinal column. 
Question: What do all vertebrates have that invertebrates don't?
[EX A]: a spinal column.

[EX Q]: Fact: Heat from the sun helps frog eggs survive and hatch into tadpoles. 
Question: What heats frog eggs so that they may hatch into tadpoles?
[EX A]: the sun.

[EX Q]: Fact: loud noises can cause animals to become dangerous. 
Question: What can cause animals to become dangerous?
[EX A]:
Loud noises.