All species on Earth, both living and extinct, are related. We know this because of a biological tool called the tree of life. This "tree" takes the form of a diagram that maps the relationships ...

This “supergroup” contains an incredibly diverse range of predatory microbes that are extremely different genetically from any other form of life on Earth. The tree of life is a useful diagram ...

Here’s how it works. By studying the genetic tree of life, scientists have determined that the first life on Earth may have lived underwater, where it would be shielded from harmful ultraviolet ...

By combining data on all known bird species, this tree is the most impressive snapshot yet of one of Earth’s most awe-inspiring classes of animal.

While such discoveries are rare, they offer unparalleled insights into Earth's early life forms, illuminating parts of the ...