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: Given two equal measures of water by volume, which would be lighter 
 Answer: distilled water?
[EX A]: Water becomes more dense when it is colder and when it has more salt.

[EX Q]: 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
[EX A]: Low food supply or a lack of space can lower birth rates, increase death rates, or lead to emigration.

[EX Q]: Question: What would happen to the sharpness of the images in Jim's telescope if he decreased the size of the mirrors inside of it? 
 Answer: become blurrier
[EX A]:
The larger a telescope's mirror or lens, the better it is at seeing narrowly separated objects as individual objects and the sharper the images look.