![Fossilized Horseshoe crab. Theses animals are considered living fossils, as they have not much changed in the 400 million years.](https://reaction.life/wp-content/uploads/2021/07/shutterstock_98325692-600x375.jpg)
Ancient brains: a look inside the extraordinary preservation of a 310-million-year-old nervous system
Even the extremely delicate anatomy of animals, such as their internal organs, can be preserved in remarkable detail.
Even the extremely delicate anatomy of animals, such as their internal organs, can be preserved in remarkable detail.
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