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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Видео How Did Sharks Survive So Many Mass Extinctions? канала Ben G Thomas