Twenty million years after the Cambrian explosion ... a chemical element that allowed them to get a clearer picture of ocean conditions millions of years ago. “Molybdenum (Mo) isotopes can ...

Cambrian shell fossils reveal predator-prey battles shaped evolution, as predators attacked and prey adapted by developing thicker shells.

Now, scientists have traced this tool to its earliest known evolutionary origins: a class of corals called Octocorallia in the depths of the ocean in the Cambrian, some 540 million years ago.

These 517-million-year-old predator-prey interactions occurred in the ocean covering what is now ... record of an evolutionary arms race in the Cambrian. “Predator-prey interactions are often ...