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.

Fact: if members of a species cannot mate with females then that species will likely become extinct. 
Question: if members of a species cannot what, then that species will likely become extinct?
mate with females.

Fact: many chemical messengers that control body functions are proteins. 
Question: What are many chemical messengers that control body functions?
proteins.

Fact: echolocation has a positive impact on an animal 's survival. 
Question: What has a positive impact on an animal's survival?

echolocation.