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 process by which organisms change in small ways over time? Answer: microevolution
Microevolution is the process by which organisms change in small ways over time.

Question: When gas particles collide, what kinds of collisions are these considered? Answer: elastic
When gas particles collide, these collisions are considered elastic.

Question: How do heavy alkanes affect the skin? Answer: form a protective layer

Form a protective layer do heavy alkanes affect the skin.