Three domains of life.
<P>
   Genome   comparisons   of  species  help  us  understand  evolutionary
   relationships.
<P>
   This  diagram  shows  the  divergence among the three domains based on
   genome evidence.
<P>
   Mammals  diverged  within the eukaryote lineage about 65 million years
   ago.
<P>
<bR>Chimpanzees are the closest species relatives to humans.