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.

[EX Q]: Question: What is the term for the length of the route between two points? Answer: distance
[EX A]: Distance is the term for the length of the route between two points.

[EX Q]: Question: What type of molecules help the plasma membrane keep its shape? Answer: cholesterol
[EX A]: Cholesterol type of molecules help the plasma membrane keep its shape.

[EX Q]: Question: What celestial events are the source of elements heavier than iron? Answer: supernovas
[EX A]:
Supernovas are the source of elements heavier than iron.