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 Input:
Question: A person is digging up rocks, and wants to get the oldest ones. The person will dig 
 Answer: deeper

Ex Output:
Older rocks are at the bottom and younger rocks are at the top.


Ex Input:
Question: Do gas engine cars pollute more or less than electric engine cars? 
 Answer: more

Ex Output:
Plug-in hybrids run for a longer time on electricity and so are less polluting than regular hybrids.


Ex Input:
Question: Mike wants his voice to travel slowly, so he will speak in a room that is 
 Answer: colder

Ex Output:

For a given medium such as air, sound has a slower speed at lower temperatures.