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Our bodies are largely water because it is such a good solvent. We have a lot of oxygen because it is very reactive and is a large chunk of both organic and inorganic matter on the Earth.
The reason we are carbon based as opposed to another element is that carbon is about to make a four bond connection. Any other elements in the same column as carbon also do this but carbon being smaller (less protons and electrons) is more stable. Carbon is what holds us together in some respects, oxygen becomes a part of the chain. Carbon, Nitrogen, Oxygen and Hydrogen make up virtually every aspect of our bodies.
Out of curiosity Bill, was that the human body by number of atoms or by mass?
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