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: 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
[EX A]: Low food supply or a lack of space can lower birth rates, increase death rates, or lead to emigration.

[EX Q]: Question: Henry noticed that his piece of cake was lighter than his piece of butter. The cake was _____ dense. 
 Answer: less
[EX A]: A given volume of a denser substance is heavier than the same volume of a less dense substance.

[EX Q]: Question: If Jimbo decreases the wavelength of the soundwave he is generating, what will happen to the energy carried by that soundwave? 
 Answer: increases
[EX A]:
Waves with shorter wavelengths have more energy.