he universal genetic language of DNA is common to virtually all organisms on Earth, however diverse. What is the best explanation for this fact?

The cells represent the basic component of the body. There are many different types of cells with different functions. These cells form all the organs and tissues of the body. Virtually all cells in a person's body have the same deoxyribonucleic acid (DNA). DNA is the hereditary material of human beings and of almost all other organisms. Most of the DNA is in the cell nucleus (called nuclear DNA), but there is a small amount of DNA found in the mitochondria (called mitochondrial DNA).

The DNA contains the code to create and maintain every organism. The code is read according to the order or sequence of four chemical bases: adenine (A), cytosine (C), guanine (G) and thymine (T) in the same way in which the letters of the alphabet are joined to form words, sentences or paragraphs. Human DNA consists of approximately three billion bases and more than 99 percent of those bases are the same in all people.