Birds typically molt their feathers in the fall,right before migration.
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Q4: The major stimulus for spring migration in
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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
Q10: Birds,like reptiles,excrete uric acid as the major
Q11: Archaeopteryx had teeth set in sockets,whereas modern
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Q13: Birds,like mammals,have non-nucleate,biconcave erythrocytes.
Q14: The wing of a modern bird shows
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