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by Stratigraphy.net
New from Snet: Lithologs, a new tool to create lithological/sedimentological logs online..

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NOTOCHORDS: CHORDATES OR CALAMARI

You and I are vertebrates, we have backbones. While we sometimes use the term to denote character, having a backbone or spinal column is what sets apart almost 70,000 species on this big blue planet. So which lucky ducks evolved one? Warm-blooded birds and mammals can claim those bragging rights. They're joined by our cold-blooded, ectothermic friends, the fish, amphibians and reptiles. All

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