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a complete skeleton by comparing the size and morphology of bones to those of similar, better-known species is an inexact art (though governed by some established allometric trends), and reconstructing the muscles and other organs of the living animal is, at best, a process of educated guesswork, and never perfect. Mass estimates for dinosaurs are much more variable than length estimates given the lack of soft tissue preservation in the fossilization process. Modern mass estimation is often done with the laser

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