How Vertebrates Got Teeth... And Lost Them Again

As revolutionary as teeth were, they would go on to disappear in some groups of vertebrates. But why?

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References: https://docs.google.com/document/d/1tBkUiyHKMRs4-odZiRa5DMSxw_wXwdHyVvQrWt1Ze9k/edit?usp=sharing

Видео How Vertebrates Got Teeth... And Lost Them Again канала PBS Eons