In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.

[EX Q]: Question: If Mona owns a car and she decides to switch to a cleaner burning fuel, will she create more or less pollution? 
 Answer: less pollution
[EX A]: The advantage to biofuels is that they burn more cleanly than fossil fuels. As a result, they create less pollution and less carbon dioxide.

[EX Q]: Question: The lighter someone's skin is the _____ melanin they have. 
 Answer: less
[EX A]: However, the melanocytes of people with darker skin produce more melanin.

[EX Q]: Question: A ball that is on the top of the empire state building about to be dropped off will have _____ potential energy than a ball on the ground. 
 Answer: more
[EX A]:
So the higher an object is above a surface, the more potential energy it has.