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: An decrease in birth rates indicates a/an _____ in the food supply. 
 Answer: decrease
[EX A]: Low food supply or a lack of space can lower birth rates, increase death rates, or lead to emigration.

[EX Q]: Question: James loved to travel the world. In his travels, he noticed that America contained a lot of industry while China contained not much industry at all. Which country produced more hazardous wastes? 
 Answer: America
[EX A]: Countries with more industry produce more hazardous wastes than those with little industry.

[EX Q]: Question: Mary loves to build and race paper boats. Compared to a small boat, would she be able to build and float a larger boat on faster moving water or slower moving water? 
 Answer: faster moving water
[EX A]:
In erosion, the more energy the water has, the larger the particle it can carry.