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The spinal vertebrae of a shark are made of cartilage, not bone, so you could rightly say sharks are vertebrates with no backbone.

If the question referes to an animal with absolutely no spine at all, the next most closely-related animal is the lancelet.

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14y ago
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Anonymous

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3y ago

Fish

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3y ago

Reptile

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Q: What animal has jointed legs gills and no backbone?
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