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Arsenic is essential to the body in low doses yet if the body accumulates more then 10-20 grams it can lead to lung, colon, or bladder cancers and has also be associated with heart issues.

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15y ago
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12y ago

Oxygen. Without it our respiration process would not work. With the ionic radical form of oxygen running loose in the body a lot of damage is done due to oxygen's very high electronegativity.

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Q: Which nonmetal is both helpful and harmful to living things?
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