Please answer this: The ozone layer helps organisms by protecting them from Sun's ultraviolet radiation. To find the usefulness of ozone layer Mike wanted to see how much ozone are there in the atmosphere. He then collected three samples of atmosphere, sample A sample B, and sample C. Sample A was collected from the upper portion of the stratosphere. Sample B was collected from the lower portion of the stratosphere. Sample C was collected from the lower atmosphere.  Which sample would have higher concentration of ozone, sample B or sample C?
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Answer: sample B


Please answer this: Whenever Bill visited Tim's house, they couldn't see that many stars when stargazing . Tim lived in the city. The sky was much clearer at night at Bill's place, because he lived in a rural area.  Which place experiences more light pollution, Tim's or Bill's?
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Answer: Tim's


Please answer this: two buildings had different tenants. Building Y had many seniors over 65 years of age, and building X had individuals under 65 years old.  Which building had fewer people that had Alzheimer's?
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Answer:
building X