Kingdom Animalia
The Animalia kingdom contains animals. Animals are defined as multicellular life forms (as compared to single-celled creatures such as bacteria, which are members of kingdom Monera). Animals are also heterotrophic, meaning they require complex organic compounds of nitrogen and oxygen typically found in other organisms to sustain life. Members of the Animalia kingdom reproduce sexually and inhabit many different environments. There are two subclassifications, called subphyla, into which animals are separated: invertebrates, which have no backbones, and vertebrates, which do have backbones. Invertebrates are simpler in form and function than vertebrates. Vertebrates are the most complex organisms in the animal kingdom.
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