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.

Example Input: Question: Mona lives in a nation that uses a lot of fossil fuels. What would happen to her countries levels of air pollution if they were to decrease their usage? 
 Answer: decrease
Example Output: Because richer nations use more fossil fuels, they also cause more air pollution and global warming than poorer nations do.

Example Input: Question: Would a big star be 
 Answer: hotter
Example Output: Bigger stars produce more energy, so their surfaces are hotter.

Example Input: Question: Rich works out every day. Paul does not work out at all. Whose heart expels more blood per contraction, resulting in lower BPM? 
 Answer: Rich
Example Output:
When a person exercises regularly, and is fit, the heart undergoes certain long-term adaptations. The heart muscle gets stronger, and expels more blood with each contraction.