The fish, a vertebrate, has a backbone while the invertebrates do not.
Invertebrates are multicellular, have no back bone or cell walls, they reproduce sexually, and they're heterotrophic. Vertebrates, have a well-developed internal skeleton, a highly developed brain, an advanced nervous system, and an outer covering of protective cellular skin. 98% of animal species are invertebrates while 2% are vertebrates. Invertebrates are Small and slow moving, while vertebrates are Big in size.
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