Fish, flies and bears, oh my! A new research breakthrough gives genetic proof of how differences in (very different) animals develop. An international team of biologists has identified the molecular ...

Classification attempts to impose a hierarchy on the complex and dynamic variety of life on Earth by describing how different species group together and how they are related to one another or not.

There are millions of different types of living things on Earth. In order to keep track of them all, scientists put living things into groups based on characteristics that they have that are the same.