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: John was in his office looking at the diagrams. He saw that as the lines were sparser, the fields were 
 Answer: Weaker
Example Output: The closer the field lines are drawn together, the stronger the field being described.

Example Input: Question: A planet that is larger has 
 Answer: more gravity
Example Output: Objects with greater mass have a stronger force of gravity between them.

Example Input: Question: A population of squirrels in a local forest had less food available to them this spring than they did last spring. During which spring will more squirrels leave the area to live somewhere else? 
 Answer: this spring
Example Output:
Low food supply or a lack of space can lower birth rates, increase death rates, or lead to emigration.