instruction:
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.
question:
Question: John was observing a range of patients skin under a microscope. He noticed that the more melanocytes the skin had, the production of melanin was 
 Answer: higher
answer:
However, the melanocytes of people with darker skin produce more melanin.


question:
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
answer:
Because richer nations use more fossil fuels, they also cause more air pollution and global warming than poorer nations do.


question:
Question: Sean is trying to see how fast the water molecules are moving in a container of water. He observes that the molecules are moving very slowly, so the temperature must be 
 Answer: cool
answer:

When a volume of water is cooled, the molecules move less vigorously, so same number of molecules takes up less space and the water is denser.