Evolution is arguably the most solid theory in modern biology. It has represented the foundation of biological research for centuries now and it’s still the basis over which many present day discoveries are made. Take the human teeth for example: its usefulness is undeniably linked to our evolution as a big, solid food churning species and its appearance is a solid indicator of the evolution of biological processes throughout species. Previous methods of food deconstruction involved a sandpaper like mouth but the Placoderms, a group of fish living some 400 million years ago are believed to be the first to exhibit bony jaw structures. It was thought that these fish had what you’d call “real teeth” but recent analysis from the Australian National University, which employed 3D printing and 3D scanning of a Buchanosteus fish fossil revealed evidence that the group could have represented a transitional link.