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Fluorine has the highest electronegativity.
So the correct answer is Fluorine.
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Soft iron makes good temporary magnets.
So the correct answer is Iron.
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By mass, after oxygen and carbon, hydrogen (~10%) is often listed third.
So the correct answer is Hydrogen 10%.
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Galactic magnetic fields deflect/trap charged cosmic rays.
So the correct answer is Cosmic rays.
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Trachoma is an infectious disease of the eyes.
So the correct answer is Eyes.
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Lungs expel carbon dioxide from venous blood.
Hence the keyed answer is Carbon Dioxide.
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