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Hydrogen carbon and oxygen are chemical elements. These three are particularly special as they are the most essential elements to life.

Hydrogen is the first and simplest of all the elements and the most abundant in the universe. It is one of the two elements in water and is one of the two elements needed for a compound to be considered organic.

Carbon is the sixth element and also one of the most abundant. It is the basis of organic chemistry. All known life is carbon based.

Oxygen is the eighth element and the most abundant in earth's crust. It is the other component of water and is also in most organic compounds.

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