|From blue-green algae to
the bald eagle, there are over a million known species on our planet
Earth. This amazing array of life, or biodiversity, is everywhere you
look—its even in places you cant see, like deep underground.
Wherever theyre found,
all living things are related because they all share a common ancestor.
To show how species are related, scientists create diagrams called cladograms.
Like a family tree, a cladogram shows close and distant relatives. Scientists
call the family tree for all species on Earth the "Tree of Life."