Archaeopteryx had teeth set in sockets,whereas modern birds are completely toothless.
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Q6: Like modern birds,Archaeopteryx had a sternum and
Q7: Most male birds have a retractable penis
Q8: The respiratory system of birds is structured
Q9: Birds typically molt their feathers in the
Q10: Birds,like reptiles,excrete uric acid as the major
Q12: The most common type of mating system
Q13: Birds,like mammals,have non-nucleate,biconcave erythrocytes.
Q14: The wing of a modern bird shows
Q15: Mature feathers are dead structures and must
Q16: The supracoracoideus muscles raise the wings in
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