The ordovician
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from or referring to the period of time between about 485 and 445 million years ago, in which there were many different types of animals in the sea, including vertebrates (= animals with backbones) , but no life on land:
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the period of time between about 485 and 445 million years ago, in which there were many different types of animals in the sea, including vertebrates (= animals with backbones) , but no life on land:
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