the pattern bears a remarkably close resemblance to a DNA fingerprint. (See Create a DNA Fingerprint.) Every year a new ring of growth is added to a tree's trunk and branches, just beneath the bark.

The researchers found that cedar trees exhibit two distinct swaying patterns depending on wind speed. In light winds, the ...

Phylogenies are a fundamental tool for organizing our knowledge of the biological diversity we observe on our planet. But how exactly do we understand and use these devices? Tree diagrams have ...