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: Growth factors and certain plant and animal hormones serve as molecular messengers that initiate pathways of what? Answer: cell division
[A]: Growth factors and certain plant and animal hormones serve as molecular messengers that initiate pathways of cell division.


[Q]: Question: All solutions contain at least how many substances? Answer: two
[A]: All solutions contain at least two substances.


[Q]: Question: What is the upper-most atmosphere known as? Answer: thermosphere
[A]:
Thermosphere is the upper-most atmosphere.