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: Tasha is studying birth rates in various countries. She looks at two countries. In South Africa, the food supply is currently higher than in Australia. Because of this, the birth rate in South Africa, compared to Australia, will be 
 Answer: higher
Example Output: Low food supply or a lack of space can lower birth rates, increase death rates, or lead to emigration.

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

Example Input: Question: Reid puts the same amount of gas in a 20ml container and a 10ml container. The container with the densest gas will be the _____ container. 
 Answer: 10ml
Example Output:
If we take a certain amount of gas from one container and place it into another, larger container, the gas expandsto fill the larger container. The same mass of gas is now in a larger volume, the gas now has a lower density.