It was also around this time that the first plants invaded the land. The earliest shark-like teeth we have come from an 410-million-year-old, Early Devonian fossil belonging to an ancient fish called ...

The Devonian ancestors of fishes living today belonged to two main nonarmored groups. The cartilaginous fish, so-called because cartilage formed their skeletons, later gave rise to sharks and rays.

Two nearby explosive massive star deaths, or supernovas, may have triggered mass extinction events in Earth's distant past, ...