单选题
发布日期:2022-05-16
Fossilized dinosaurs have shown many birdlike characteristics, such as bone structure and winglike arms.
If birds are in fact the descendants of dinosaurs, then it can be argued that the dinosaurs never really died out.
Flying dinosaurs such as the Pteranodon, which is not thought to have been related to modern birds, do not appear to have had feathers.
Soft tissues such as skin and feathers do not fossilize like bones, and therefore are far less likely to have left permanent evidence in the fossil record.
The thousands of dinosaur fossils excavated by paleontologists represent only a tiny fraction of the billions of dinosaurs that once lived.
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