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According to the keyed answer, it is due to surface tension.
Editor note: oversimplified; options left unchanged.
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Ibn al-Haitham (Alhazen) is widely titled Father of Optics.
So the correct answer is Ibn-al-Haitham.
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Exam keys commonly list about 304 kcal per 100 g honey.
Hence the keyed answer is 304.
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Hep A spreads fecal–orally, often through contaminated water/food.
So the correct answer is Water.
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It is thicker near the equator (~17 km) and thinner at the poles (~7 km).
Hence the keyed answer is 17 km at equator and 7 km at poles.
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