amnhnyc: Extinct mollusks known as ammonites inhabited the planet for more than 300 million years—almost twice as long as dinosaurs—before disappearing in the mass extinction event more than 65 million years ago. As many as 10,000 species may have

amnhnyc: Extinct mollusks known as ammonites inhabited the planet for more than 300 million years—almost twice as long as dinosaurs—before disappearing in the mass extinction event more than 65 million years ago. As many as 10,000 species may have

amnhnyc: Extinct mollusks known as ammonites inhabited the planet for more than