You are presented with the question "What is  found naturally in the air and soil, and in living organisms?" and the following answer choices: 
- solid, liquid, gas
 - Something with a head, thorax, and abdomen
 - metabolic reaction
 - protein,nucleic acid,chlorophy
 - Chemical energy
 - Greenhouse gasses
 - By wind and rain
 - sub-units of species

Now knowing that nitrogen is found in proteins, nucleic acids, and chlorophyll and large amounts of nitrogen are found naturally in the air and soil, and in living organisms, choose the best answer.


 

    protein,nucleic acid,chlorophy     