Answer:
Increased exposure to X-rays
Explanation:
X-rays shoot harmful radiation through your body, that's why when you go to the dentist or other places and they take a X-ray they give you a lead vest to protect your organs from unneeded radiation.
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They were imported from China into the United States in 1881.
The first successful release was in Minnesota in 1916.
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Th correct answer would be D! Hope this helps
