PBS Eons has a new episode. This one is about the origin of teeth... did they start as teeth on skin or teeth in mouth?
As revolutionary as teeth were, they would go on to disappear in some groups of vertebrates. But why?
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- 2025 ESCONI Gem, Mineral, and Fossil Show - March 15th and 16th at the DuPage Fair Grounds #show #gems #minerals #fossils #rocks #awesometime
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