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: Chemical reactions follow which laws? Answer: thermodynamics
[A]: Chemical reactions follow the laws of thermodynamics.


[Q]: Question: Exposure to what can increase the amount of pigment in the skin and make it appear darker? Answer: ultraviolet radiation
[A]: Exposure to ultraviolet radiation can increase the amount of pigment in the skin and make it appear darker.


[Q]: Question: What was the first mass extinction that occurred on earth? Answer: precambrian mass extinction
[A]:
Precambrian mass extinction was the first mass extinction that occurred on earth.