A pink sponge, photographed at an aquarium today, is not unlike one of the first life forms that appeared in the Precambrian era. Photograph by Joel Sartore, National Geographic Photo Ark The ...

Everyone has a past. That includes the millions of species of insects, arachnids, and nematode worms that make up a major ...

The Precambrian encompasses 86 percent of the history of Earth. As its name implies, this includes all of geological time prior to the Cambrian period. Hadean Era (4,550-3,850 mya) The Precambrian ...

A team of researchers has identified the earliest known ecdysozoan fossil, which originated from the Precambrian era.

A lot has happened in that time. Earth formed and oxygen levels rose in the foundational years of the Precambrian. The productive Paleozoic era gave rise to hard-shelled organisms, vertebrates ...

Scientists have identified Uncus dzaugisi, the oldest ecdysozoan fossil from the Precambrian period, confirming long-held ...

More extensive Precambrian finds ... that skeletonized creatures of the Cambrian period, long thought by scientists to be the first multicellular animals, had predecessors. Debate continues ...