SPONCH?

Need a quick and easy way of remembering the most common elements in living organisms? 

Remember the word : SPONCH - S(Sulfur) P(Phosphorus) O(Oxygen) N(Nitrogen) C(Carbon) H(Hydrogen)

Better yet, SPONCH also tells ya which elements are the most common by reading it backwards (beginning with Hydrogen as most common, next to Carbon and so on)