ANSWERS: 10
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a back bone!
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Vertebrae.
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A spine and bones-worms, jellyfish, all sortsa nasty gooey crawly or floaty things.
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An internal vertebral structure, of course!
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a spine...but most of them go on to become politicians, so it's okay.
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Just like my ex, inter-vertebrates lack a backbone.
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All invertebrates lack a backbone (ie vertebral column or notochord). Interesting piece of knowledge: The hagfish was considered a Vertebrate although it lack even a notochord--hence the clade Craniata was created.
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They don't lack anything but they don't have a backbone
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A spine, spinal collumn, backbone, vertabre, call it what you will.
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Bones, But I don't know how they can hold their head. Maybe with some special glue
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