Fish and CHONPS

Explain the uses of carbon, hydrogen, oxygen, nitrogen, phosphorous and sulfur in biological systems.
These six elements are the majority of building blocks that make up all living matter.
Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorous and Sulfur are the six elements that make up functional groups. Functional groups are components of organic molecules that are involved in chemical reactions. 

There are seven such groups: 
Hydroxyl
Carbonyl
Carboxyl
Amino
Sulfhydryl
Phosphate
Methyl

These functional groups are what allow molecules to bond together and create more complex biological systems. For example, phosphorous, oxygen, and hydrogen make up the phosphate group. DNA is built from this functional group, and as a results proteins can be created from the code written in the DNA. 
These proteins can come together to make say.. a fish. Hm. I'm kind of craving Fish and Chips right now.