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They demonstrate that most of life's genetic diversity turns out to be microbial; the entire animal kingdom (shown at the upper right) are just a few twigs at one end of the tree.

The DNA variation (between species) shows only the genetic difference, which can be calibrated with known time difference from fossil records (Figure 10-02e).The time scale (in billions of years) is referred to the appearance of oldest fossils.Study of DNA variation among different species provides another way to classify them as shown by the tree of life in Figure 10-02a.For example, human belongs to the genus Homo (in capital) and the species sapiens - hence Homo sapiens (in italic).However, such naming system is not perfect; it has incited many heated debates among taxonomists for the assignment of organism into certain category.

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