Diego Cardeñosa
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How a DNA test is helping sharks on the verge of extinction

Marine scientist Diego Cardeñosa is working to make sure a third of shark species, in big trouble right now, has a better chance at survival.

01:53 - Source: CNN
Protecting sharks from extinction 2 videos
Diego Cardeñosa
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How a DNA test is helping sharks on the verge of extinction
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- Source: CNN
Shalise Leesfield 1
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The Australian teenager making the ocean safer for sharks
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- Source: CNN