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.

[Q]: Question: What is at the top of the mesosphere? Answer: mesopause
[A]: The mesopause is at the top of the mesosphere.


[Q]: Question: What cellular structure is used during endocytosis to allow molecules to enter the cell? Answer: vesicles
[A]: Vesicles are used during endocytosis to allow molecules to enter the cell.


[Q]: Question: What form when water vapor condenses in the air around specs of matter? Answer: clouds
[A]:
Clouds form(s) when water vapor condenses in the air around specs of matter.