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The top documents tagged [stiffening notochord]
Chordates Chapter 23. Phylum Chordata By the end of the Cambrian period, 540 million years ago, an astonishing variety of animals inhabited Earth’s oceans
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Chapter 16 Marine Animals - Vertebrates. Phylum Chordata All members of the phylum (the most advanced of the animal phylum) have a stiffening notochord
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