Agamas are members of Kingdom Animalia because they are multicellular heterotrophs that exhibit advanced tissue differentiation and complex organ systems. They are also extremely and quickly responsive to stimuli. One branch of the animal kingdom develops into the Phylum Chordata and the Subphylum Vertebrata; vertebrates are chordates that possess a bony vertibral column. Reptiles then develop from the Phylum Chordata.
The following pages describe the evolution of the agama in great detail.
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