It's these two numbers, 20 and 13, that are used to make up the Tzolk'in calendar, the first calendar used by the Mayans. 1  1. 2  2. 3  3. 4  4. â¦. 5  5. 6.  NEXT.
Making the world better, one answer at a time. the nucleus is made up ofneutrons and protons. on the outside of the nucleus is the electrons. the nucleus is made up ofneutrons and protons. <br/>on the outside of the nucleus is the electrons.
DNA and RNA are made of nucleotides, which contain oxygen, hydrogen, nitrogen, carbon, and phosphorus. The nucleic acid backbone is comprised of sugars, made of carbon, hydrogen, and oxygen, and phosphate groups, made of phosphorus, hydrogen, and oxygen. The backbone binds to bases, which contain a nitrogen element.