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.

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
Low food supply or a lack of space can lower birth rates, increase death rates, or lead to emigration.

Question: Asa is running in a race and his body temperature decreases. His skin's blood vessels _____ in diameter. 
 Answer: decrease
When your brain senses that your body temperature is increasing, it sends messages to the blood vessels in the skin to increase in diameter.

Question: Dr. Roberts noticed a increase in the death rate. A(n) _____ chance of deadly disease likely contributed to this factor. 
 Answer: increased

With better food and less chance of disease, the death rate fell.