sharks

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Sharks existed before trees Trees are young'ns compared to the geezer sharks that rule the sea. Sharks have existed for around 400 million years, while trees became their own official species only 350 million years ago. Other notable animals that outlive our leafy ancestors are the horseshoe...

Shark's don't technically sleep It was originally believed that sharks don't sleep because they always need to stay moving in order for oxygen-rich water to flow through their gills, which is how they breathe. However, that theory was disproved when scientists observed how sharks are able to...