What are the main chemical elements in most living things?

Question

What are the most common chemical elements in most living things?

Answer 1

That's hard to pin down.
 

I'll say carbon, nitrogen, oxygen, and phosphorus. It differs in other organisms, though.

Answer 2

CHNOPS - six most common elements in all life forms:  carbon, hydrogen, nitrogen, oxygen,  phosphorus and sulfur.

Vertebrates differ slightly with calcium being a major part of the skeleton so it edges out sulfur as one of the top six.

The biology of the elements:    http://www.webelements.com/biology.html