The closest livng relative to a dinosaur are chickens, ostriches and alligators. The T-rex has vertebrate (backbone animal), who happens to come from a family tree related to chickens, ostriches and alligators. Researches compared chicken, ostriches and alligators’ proteins with a t-rex’s and they a lot of similar qualities. Dinosaurs share a more genetic makeup with birds than with many modern day vertebrates.
Probably birds, lizards, and reptiles.
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