Multicellular, eukaryotic organisms that range in complexity from simple sponges to complex vertebrates belong to the kingdom:

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The kingdom Animalia includes all multicellular, eukaryotic organisms that lack cell walls and are heterotrophic, meaning they obtain their energy by consuming other organisms. This includes a wide range of organisms, from simple sponges to complex vertebrates like mammals and birds. Fungi, Monera, Plantae, and Protoctista are other kingdoms of life, but they do not include all the characteristics described above.

Multicellular, Eukaryotic Organisms That Range in Complexity from Simple Sponges