species

In recent decades, the populations of many vulture species declined sharply and are now acutely threatened with extinction.

"In fact, scientists used to believe that the Y chromosome lacked genetic variety, which we believed meant that it didn't contribute much to species diversity."

The Aleppo pine, for instance, is a fast-growing species found throughout the western Mediterranean, Greece and parts of the Levant, including northeastern portions of historical Palestine.

Imagine the gene pool of a species as a deck of cards.

Although the species was probably not the common ancestor to all ecdysozoans, the authors note, the discovery contributes a significant addition to our understanding of the diversity of life before the so-called Cambrian explosion.