A recent study shows that marine oxygen levels were crucial to the evolution of early Paleozoic trilobite body size, ...

Exactly which animals were affected ... The Phanerozoic Eon is divided into the three eras. The oldest is the Paleozoic Era, which means ‘ancient life’ and occurred between 541 and 252 ...

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

The names Paleozoic, Mesozoic, and Cenozoic all describe the types of fossils that have been found relating to those periods. In the Mesozoic Era, there are fossils that represent both extinct groups ...

Stromatoporoid sponges were major reef builders during the Paleozoic era, playing a foundational role ... valuable insights into the early biomineralization strategies of ancient animals.

Left behind were more than 900 lab animals. The institute ultimately managed to relocate about two-thirds of them — primarily mice, as well as a handful of rats — sending them to university ...