TASK DEFINITION: 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.
PROBLEM: Fact: Gene flow occurs when individuals migrate. 
Question: Migration increases what?

SOLUTION: gene flow.

PROBLEM: Fact: Birds have backbones. 
Question: What animals have a backbone?

SOLUTION: Birds.

PROBLEM: Fact: some vertebrates have no hard tissues. 
Question: What do some vertebrates not have?

SOLUTION:
hard tissue.