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.

Question: All cells undergo what during a lifetime, but when this process is out of control, cancer results? Answer: cell division
All cells undergo cell division during a lifetime, but when this process is out of control, cancer results.

Question: Which of the following has changed over the last 200 years primarily due to human activity? Answer: the composition of the atmosphere
The composition of the atmosphere has changed over the last 200 years primarily due to human activity.

Question: Where does an electron move to after it absorbs energy? Answer: a shell farther from the nucleus

An electron moves to a shell farther from the nucleus after it absorbs energy.