What can the sequence of dna tell us about life on earth?

DNA sequences provide a map of the genetic changes because of living species have evolved from common ancestors. By comparing DNA sequences of different organisms, we should be able to reconstruct the evolutionary history of life on Earth.

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.