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: Geremy went to the gym frequently, while Tim did not. Who likely has larger muscles? 
 Answer: Geremy
Exercising muscles increases their size, and bigger muscles have greater strength.

Question: When we pack a fewer things into a box it becomes 
 Answer: less dense
The more tightly packed the particles inside the material are, the more dense we say they are.

Question: If you are able to add greenhouse gases the temperature will 
 Answer: go up

A decrease in greenhouse gas levels decreases global temperature and an increase raises global temperature.