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: Katie has a garden and she installs a small waterfall. Since Katie sets the water to flow very slow and gentle over the sloping fall, the erosion at the bottom of the waterfall will be 
 Answer: less
[EX A]: A gentle slope favours slower flow of surface water, reduces erosion, and increases availability of water to plants.

[EX Q]: Question: Sally has an electron. Sue has an electron that is closer to the nucleus. Whose electron has lower energy? 
 Answer: Sue
[EX A]:
Electrons at lower energy levels, which are closer to the nucleus, have less energy.