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: Dana washes her hands a lot, so her bacteria has mutated to help to resist antibiotics. As that bacteria decreases in numbers, the mutation becomes 
 Answer: rare

A: Bacteria with a mutation the helps resist antibiotics increase in numbers, so the mutation becomes more common.
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Q: Question: When a rubber band is relaxed, its elastic force 
 Answer: decreases

A: The elastic force increases the more the material is stretched or compressed.
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Q: Question: If Jim raises the temperature of water in his bathtub, what happens to the density of the water? 
 Answer: decreases

A:
Water becomes more dense when it is colder and when it has more salt.
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