The History of Life:
Looking at the Patterns
The central ideas of evolution are that life has a historyit has changed over timeand
that different species share common ancestors.
Here, you can explore how evolutionary change and evolutionary relationships are represented
in family trees, how these trees are constructed, and how this knowledge affects
biological classification. You will also find a timeline of evolutionary history and information on
some specific events in the history of life: human evolution and the origin of life.