Answer:
an increase in skin cancer can be traced to a decrease in atmospheric ozone.
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Answer: Ozone
Explanation: There is a increase in chance of cancer now a days as compared to earlier time because of ozone depletion.
Due to various types of human activities there are many holes in the ozone due to which harmful ultraviolet rays is entering on earth and there is an increase in the chances o skin cancer.
So, the correct answer is ozone