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: Shane spent his live in the country and had no respiratory conditions, then moved to the city and had several develop. Shane's conditions are likely due to being 
 Answer: close to a city
[EX A]: Certain respiratory conditions can be made worse in people who live closer to or in large cites.

[EX Q]: Question: Jim's skin was noticeably darker than his friend Matt's skin. This means that _____ produces more melanin. 
 Answer: Jim
[EX A]: However, the melanocytes of people with darker skin produce more melanin.

[EX Q]: Question: When we get to the bottom of a mountain the air is 
 Answer: more dense
[EX A]:
At higher elevations, there is less air to press on a given area.