instruction:
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:
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
answer:
Low food supply or a lack of space can lower birth rates, increase death rates, or lead to emigration.


question:
Question: Water falling down a tall mountain will move 
 Answer: faster
answer:
Water flowing over a steeper slope moves faster and causes more erosion.


question:
Question: Mary is looking through her new telescope. She sees some objects in space that are exerting gravitational pulls on each other. If the first two objects are 50,000 miles apart, and the second set of objects are 100,000 miles apart from each other, then the gravitational pull of the first set of objects is 
 Answer: greater
answer:

The closer objects are, the stronger the gravitational pull between them.