Ancient jawless fish's head fossilized in 3D hints at evolution of vertebrate skulls
(CNN) — Hundreds of millions of years ago, jawless fishes swam Earth’s seas, their brains protected on the outside by armored skin, and on the inside by plates made of cartilage. Scientists are still piecing together how modern vertebrates’ skulls evolved from these ancient fish ancestors, which were the first animals with backbones. Now, recent analysis of a spectacular fossil is filling in some gaps.
Source: wral.com
