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PLZ HELP ASAP!!!!!! What are the organisms still alive that display some of the earliest vertebrate evolutionary characteristics?
Hag Fish and Lamprey Vertebrates are the organism which posses a vertibral column(aka the spine or back bone structure), while the earliest had a head they lacked a spine and jaw, these jawless vertebrae lived 500-600 million years ago. they are the ancestors of bony fish which in time became amphibians and other groups of animals
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