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: Do gas engine cars pollute more or less than electric engine cars? 
 Answer: more
Example Output: Plug-in hybrids run for a longer time on electricity and so are less polluting than regular hybrids.

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: If Jim increases the amount of energy in the sound wave he is producing, the particles inside the water he is screaming into 
 Answer: move faster
Example Output:
The more energy the wave has, the farther the particles of the medium move.