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.

[Q]: Question: If Jim lowers the temperature of water in his bathtub, what happens to the density of the water?
Answer: increases
[A]: Water becomes more dense when it is colder and when it has more salt.

[Q]: Question: Sandra is in a dark building and then suddenly goes exits onto a sunny street. Sarah's pupils will do this in response to the new bright light
Answer: shrink
[A]: The pupil automatically gets bigger or smaller to let more or less light in as needed.

[Q]: Question: Mike wants to get the most hydrogen ions that he can out of his acid, so he will get an acid that is
Answer: stronger
[A]:
A stronger acid produces more hydrogen ions than a weaker acid.