What are adenine, cytosine, thymine, uracil and guanine made of?

Question: What are adenine, cytosine, thymine, uracil and guanine made of?
- Keywords:
  adenine,
  cytosine,
  guanine,
  thymine,
  uracil
Asked by Eacker can't count (marz to Adam on 12 Mar 2018.
- Adam Ruben answered on 12 Mar 2018:
  
  (You’re not asking me to help you cheat on a science exam, are you?) 🙂
  
  They’re made of the same elements that most other biological molecules are made of: carbon, hydrogen, nitrogen, and oxygen.

Question: What are adenine, cytosine, thymine, uracil and guanine made of?