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: A dark skinned man and a light skinned man are being tested to see who produces vitamin D faster. The light skinned person will have vitamin D in amounts that are 
 Answer: greater
Pigments in the skin act like a filter that can prevent the skin from making vitamin D. As a result, people with darker skin need more time in the sun than people with lighter skin to make the same amount of vitamin D.

Question: Carbon dioxide levels increasing cause the temperature to 
 Answer: increase
An increase in greenhouse gases leads to greater greenhouse effect.

Question: Milo lives in a small city, but the city has recently become more popular with young people. If more young people begin leaving the city, what happens to the growth rate of the city? 
 Answer: decreases

In exponential growth as the population size increases, the growth rate also increases.