Acanthodian, a fish, was one of the first vertebrates with jaws. This revolutionary adaptation allowed fish, a once-rare lifeform, to take over the planet. Learn more in this video from Animal...
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Acanthodian, a fish, was one of the first vertebrates with jaws. This revolutionary adaptation allowed fish, a once-rare lifeform, to take over the planet. Learn more in this video from Animal Planet's "Animal Armageddon."