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The earliest evidence of shark scales dates back 420 million years which means they survived several mass extinctions. How exactly were they able to do that?

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Previous Series:

How Particle Accelerators Teach Us About The Universe: [ Ссылка ]

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Sources:

Biology Of Sharks And Rays:
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“Checklist of Living Chimaeras: Some 42 species of living chimaera are known, divided into three families."

Sharks:
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“There are more than 500 species of sharks swimming in the world’s ocean. Yet when most people think of these cartilaginous fish, a single image comes to mind: a large, sharp-toothed and scary beast."

Shark Fins:
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“Bony fish and sharks both have fins that help them to move through the water. However bony fish are able to fold down their fins when they are not being used unlike a shark whose fins are rigid."

Silurian Period Facts: Climate, Animals & Plants:
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“The Silurian Period occurred from 443 million to 416 million years ago. It was the third period in the Paleozoic Era. It followed the Ordovician Period and preceded the Devonian Period. "

The Epic History Of Sharks:
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“When you imagine a shark, you may think of a torpedo-shaped, streamlined creature with a prominent dorsal fin, a large mouth ringed by sharp, triangular teeth and a crescent-shaped tail. Jaws, basically."

Prehistoric Sharks Escaped Mass Extinction By Diving Deeper:
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“The most severe extinction in the earth's history began 252 million years ago, wiping out 90 percent of ocean species and 70 percent of life on land. Modern sharks and their relatives were among the few that survived this "Great Dying," and new fossil finds hint as to how they may have clung on to life."

Sharks Were Once Called Sea Dogs, And Other Little-Known Facts:
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“If you were to ask an average person to differentiate between a tiger shark, Great White, whale shark, bull shark or mako, most could probably do so, or would at least be aware that such varieties existed."

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DNews Plus is built for enthusiastic science fans seeking out comprehensive conversations on the geeky topics they love. Host Trace Dominguez digs beyond the usual scope to deliver details, developments and opinions on advanced topics like AI, string theory and Mars exploration. DNews Plus is also offered as an audio podcast on iTunes.

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