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 type of tissues are major barriers to the entry of pathogens into the body? Answer: mucosal
[A]: Mucosal tissues are major barriers to the entry of pathogens into the body.

[Q]: Question: When do weather balloons return to earth? Answer: when it bursts
[A]: When it bursts do weather balloons return to earth.

[Q]: Question: What is the term for a state of matter that yields to sideways or shearing forces? Answer: fluid
[A]:
Fluid is the term for a state of matter that yields to sideways or shearing forces.