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: What is the name of film that polyester fibers form? Answer: mylar
The name of film that polyester fibers form is mylar.

Question: Which unit is used to express the amount of energy in food? Answer: Calorie
A calorie is used to express the amount of energy in food.

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.