@ Gundi und petronius
Birds are not dinosaurs
The bones of the wing of Archaeopteryx look very much like the bones of the theropod dinosaur, Deinonychus. Indeed, the resemblance is so striking that it convinced a very large percentage of the scientific community that birds are descended from the theropod dinosaurs.
The results of the recent studies show that the hands of the theropod dinosaurs are derived from digits I, II, and III, whereas the wings of birds, although they look alike in terms of structure, are derived from digits II, III, and IV. If birds were descended from the theropod dinosaurs, we would expect homologous structures to be derived from comparable regions. One could propose that bird wings were originally derived from digits I, II, and III, but later developed another fourth digit, while the first digit regressed. However, there is no fossil evidence that this ever happened (and would be extremely unlikely, since the bird wing was fully developed, even in Archaeopteryx).
The big problem for evolution
It is virtually impossible for an animal that breathes by means of a diaphragm to evolve into an animal which breathes the way modern birds do, because the hypothetical intermediate creature would be severely hampered in its ability to breathe.
Einfach hier weiter lesen:
*.godandscience.org/evolution/dinobird.html
[*) http://www einfügen! Direkte (automatische) Fremdverlinkungen sind derzeit im Forum unerwünscht. Bitte beachten! /Ekkard]
Birds are not dinosaurs
The bones of the wing of Archaeopteryx look very much like the bones of the theropod dinosaur, Deinonychus. Indeed, the resemblance is so striking that it convinced a very large percentage of the scientific community that birds are descended from the theropod dinosaurs.
The results of the recent studies show that the hands of the theropod dinosaurs are derived from digits I, II, and III, whereas the wings of birds, although they look alike in terms of structure, are derived from digits II, III, and IV. If birds were descended from the theropod dinosaurs, we would expect homologous structures to be derived from comparable regions. One could propose that bird wings were originally derived from digits I, II, and III, but later developed another fourth digit, while the first digit regressed. However, there is no fossil evidence that this ever happened (and would be extremely unlikely, since the bird wing was fully developed, even in Archaeopteryx).
The big problem for evolution
It is virtually impossible for an animal that breathes by means of a diaphragm to evolve into an animal which breathes the way modern birds do, because the hypothetical intermediate creature would be severely hampered in its ability to breathe.
Einfach hier weiter lesen:
*.godandscience.org/evolution/dinobird.html
[*) http://www einfügen! Direkte (automatische) Fremdverlinkungen sind derzeit im Forum unerwünscht. Bitte beachten! /Ekkard]