New Study Shows Animal Family Tree Looking Bushy In Places

New Study Shows Animal Family Tree Looking Bushy In Places: "'It turns out that early in the origin of many types of animals, there were a lot of branching events in a short period of time,' Carroll explains. Those type of episodes at key junctures in life's history - for example, the rise of complex animals or the migration of vertebrates from the sea to land - make the animal tree look very bushy and very murky, Carroll's group reports."