DNA
CO2 or carbon dioxide because a chemical reaction is when two or more elements bond together chemically in this case carbon and oxygen are bonding.
Atoms / Strings.
The material of CHROMOSOMES. It is a complex of DNA; HISTONES; and nonhistone proteins (CHROMOSOMAL PROTEINS, NON-HISTONE) found within the nucleus of a cell.
ATP is made from the sugar ribose, the nitrogenous base adenine and a chain of three phosphate groups bonded to it.