Chemistry
The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is

carbon
oxygen
hydrogen
nitrogen

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Chemistry
Table salt gets moist during rainy season because

Sodium chloride is hygroscopic
Sodium chloride is deliquescent
Sodium chloride contains hygroscopic impurities like magnesium chloride
Sodium chloride contains some quantity of sodium iodide

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