The Paleozoic era's Silurian period saw animals and plants finally emerge on land. But first there was a period of biological regrouping following the disastrous climax to the Ordovician.

Symbiotic relationships among marine organisms during the Paleozoic era have garnered significant interest in recent research. These relationships, which can range from mutualism to commensalism ...

3 min read The Cambrian period, part of the Paleozoic era, produced the most intense ... Among them were the chordates, to which vertebrates (animals with backbones) such as humans belong.

Single-celled algae called acritarchs and the Ediacaran animals vanish from the fossil record at the end of the Vendian, the period that closes the Proterozoic era. If they were wiped out by an ...

Their record indicates a dramatic increase in the oxygenation of the oceans during the Late Paleozoic era, hundreds of millions of years after the emergence of the first animals. This aligns with ...