You are presented with the quiz "What is the chemical element with symbol N and atomic number 7 found in?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "nitrogen is found in proteins, nucleic acids, and chlorophyll" and "absorption of nitrogen by plants is part of the nitrogen cycle ". 

So, what's the best answer to the question?


 

 Chlorophyl          