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: If Mona is comparing the erosion rates of two rocks and she notices that granite is softer then marble, which rock will water erode slower? 
 Answer: marble
Example Output: The water erodes the softer rock faster than the harder rock.

Example Input: Question: When a rabbit farmer begins a farm he starts with many rabbits. If the rabbits are not cared for and fed does the population 
 Answer: decrease
Example Output: With exponential growth, the population starts out growing slowly. As population size increases, the growth rate also increases.

Example Input: Question: John's town used to have lots of water, back when there were only a few hundred people. However, now that the town holds several thousand people, the water availability is 
 Answer: scarce
Example Output:
Many of the worlds people live with water scarcity, and that percentage will increase as populations increase and climate changes.