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Topic: Almost 20 Million Years Ago, Sharks Nearly Went Extinct — Nobody Knows Why (Read 40 times) previous topic - next topic

Almost 20 Million Years Ago, Sharks Nearly Went Extinct — Nobody Knows Why

Almost 20 Million Years Ago, Sharks Nearly Went Extinct — Nobody Knows Why

[html]Oceanography and paleontology work recently uncovered the mysterious disappearance of most sharks in the ocean millions of years ago. Are these ocean predators still facing decline today?[/html]

Source: Almost 20 Million Years Ago, Sharks Nearly Went Extinct — Nobody Knows Why (http://ht**://www.discovermagazine.c**/environment/almost-20-million-years-ago-sharks-nearly-went-extinct-nobody-knows-why)