Element essential for existence of life.?

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Answer:
Well, they all seem pretty important to me. But if you forced me to choose, I'd go with Carbon.
Carbon is the most essential, but H, O, and N are also very essential because they are components of biomolecules
Carbon and Hydrogen both seem important to me, Oxygen follows in there as well. Nitrogen is quite essential as well.

All organic matter is made of HydroCarbons.
Water is made of Hydrogen and Oxygen.
Nitrogen is key to the structure of genetic material.
Hydrogen forms special bonds with Nitrogen and Oxygen to give structure to proteins and genetic materials.

It is a little hard to pick one element essential to life as there are about 12 key elements and another dozen or so minorly important ones.

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