TASK DEFINITION: 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.
PROBLEM: Question: What describes the amount of solute in a solution? Answer: tonicity

SOLUTION: Tonicity describes the amount of solute in a solution.

PROBLEM: Question: What is at the top of the mesosphere? Answer: mesopause

SOLUTION: The mesopause is at the top of the mesosphere.

PROBLEM: Question: If a substance has a ph value greater than 7, what does it indicate? Answer: base

SOLUTION:
If a substance has a ph value greater than 7,that indicates that it is base.