In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

[EX Q]: Question: The lungs of mammals are unique in having what? Answer: alveoli
[EX A]: The lungs of mammals are unique in having alveoli.

[EX Q]: Question: What's it called when the reaction is sped up until equilibrium is established? Answer: favoring
[EX A]: What's it called favoring the reaction is sped up until equilibrium is established.

[EX Q]: Question: Why do comet tails always point away from the sun instead of trailing behind the comet? Answer: dust particles recoil
[EX A]:
Comet tails always point away from the sun instead of trailing behind the comet because dust particles recoil.