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Vertebrates have an internal skeleton of cartilage or bone, with vertebrae surrounding the dorsal nerve cord.

A different Perspective:

There are overlaps, but generally:

Animal oxigenates using gills, or using lungs

Has hollow bones, or solid

Is ectothermic, or endothermic

Has fins, or no fins

Requires moist, water, or air environment

Lays eggs in water, or out of water

Lays eggs, or gives live births

Number of each type of vertebrae

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