Human teeth have not evolved from the mouth?Ancient fish fossils tell you the answer

Science Fiction Network August 29 (Wang Xiuxia) Where does human teeth originate? Are they evolved from somewhere outside the body, or are they evolved somewhere inside the mouth? These issues have always troubled biologists. Recently, foreign researchers said in the "Anatomy" that human teeth may not evolve from the mouth.

The fish fossils used in the study are called sawnium. They lived in North America about 65 million to 10 million years ago and have been extinct. Like a shark, there are jagged spikes around the nose of this creature to resist predators. Biologists call these spikes as beak -shaped festivals and think that they evolve from the scales on the saw.

(Picture source: science alert)

In order to study the relationship between beak -shaped tooth festivals and scales, the research team analyzed the outer layer of the hard tooth enamel of the nasal spines. But the research results are obviously different from their expectations.

Pennsylvania State University paleontologists said, "enamel at the beak -shaped tooth festival is much more complicated than enamel with the scale. The overall tissue of this ancient sawdo catfish is similar to modern shark enamel body." Researchers speculate that Because enamel is composed of fluorphyglite micro -crystal bags, they are randomly arranged along the direction of the surface vertical on the surface of the teeth. It is these different directions to give fish tooth strength and pressure resistance.

These contents show that the teeth of fish may evolve from its external scales. As scientists discover the similarity between the teeth of more and more marine life and human teeth, human teeth are likely to evolve from the outside.

Interestingly, researchers do not intend to study the evolutionary history of teeth while starting to analyze the beak -shaped teeth festival, but their discovery may have a significant impact on the future research in the field.

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