How Did Sharks Survive So Many Mass Extinctions?

How Did Sharks Survive So Many Mass Extinctions?

Sharks have been around for over 400 million years, and in that time have made it through 4 of the 'Big 5' mass extinctions of life. How did they manage this? And will they be able to survive the sixth major mass extinction?

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Sources:
https://web.archive.org/web/20081223011855/http://www.elasmo-research.org/education/evolution/earliest.htm
https://en.wikipedia.org/wiki/Late_Devonian_extinction
https://www.sciencedirect.com/science/article/pii/S0031018298002181
https://www.pnas.org/content/107/22/10131
https://www.geosociety.org/gsatoday/archive/22/1/article/i1052-5173-22-1-4.htm
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1692181/
https://www.fossilguy.com/gallery/vert/fish-shark/shark_evolution/shark_evolution.htm
http://www.bbc.co.uk/earth/story/20151003-the-epic-history-of-sharks
https://pubs.geoscienceworld.org/gsa/geology/article/45/5/395/207898/Extinction-selectivity-among-marine-fishes-during
https://www.nature.com/articles/ncomms3669
https://en.wikipedia.org/wiki/Triassic%E2%80%93Jurassic_extinction_event
https://sciencenordic.com/animals--plants-forskerzonen-researcher-zone/mass-extinction-66-million-years-ago-paved-the-way-for-modern-shark-communities/1458049
https://www.sciencedirect.com/science/article/pii/S0960982218307632
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0178294
https://www.pnas.org/content/112/28/8537
https://science.sciencemag.org/content/372/6546/1036
https://www.newscientist.com/article/2279774-sharks-were-almost-wiped-out-in-an-extinction-19-million-years-ago/amp/
https://www.nature.com/articles/s41586-020-03173-9

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