In this task, you are given a sentence and a question, you would be asked to create the answer which is contained in the sentence provided.

[Q]: Sentence: Motion can be defined simply as a change in position. Question: What can be defined simply, as a change in position?
[A]: motion


[Q]: Sentence: The composition of the atmosphere has changed over the last 200 years primarily due to human activity. Question: Which of the following has changed over the last 200 years primarily due to human activity?
[A]: the composition of the atmosphere


[Q]: Sentence: An exploding firework is seen before it is heard observation demonstrates that light waves travel much faster than sound waves. Question: Which observation demonstrates that light waves travel much faster than sound waves?
[A]:
An exploding firework is seen before it is heard.