Deoxyribonucleic Acid (DNA)

Is a molecule that contains the biological instructions that make each species unique. DNA, along with the instructions it contains, is passed from adult organisms to their offspring during reproduction. The same DNA is located in nearly every cell of the human body. Human DNA is made up of around 3 billion base pairs, and more than 99% of those bases are the same in all people, according to the U.S. National Library of Medicine (NLM).