23. Gnathostome: (Sheltie) A gnathostome is any jawed vertebrate. Sheltie are vertebrates and have a jaw structure, and therefore they are examples of a gnathostome.
39. Tetrapod: (English pointer) A tetrapod is defined as any four-legged vertebrates. English pointers are examples of tetrapods, because they are vertebrates and have four legs.
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