The order in which major invertebrate features evolved generally follows this sequence: first, the emergence of multicellularity, leading to the development of simple body plans. Next, the evolution of tissues and symmetry, particularly radial symmetry in cnidarians. Subsequently, the rise of bilateral symmetry and the development of more complex organ systems in flatworms and other groups, followed by the evolution of coelomates and segmented body plans in arthropods and annelids. Finally, the diversification into various phyla with specialized structures and adaptations.
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