Most of the birds that migrate breed in the more southern latitudes of the Earth.
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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
Q17: Because of the demands of flight,the circulatory
Q19: In birds,reproductive organs of both sexes shrink
Q20: The raptors,such as hawks and eagles,are notable
Q21: Birds are
A)synapsids.
B)diapsids.
C)anapsids.
D)aviapsids.
Q22: Bird species far outnumber all other vertebrates
Q23: Flying birds with keeled sternums are known
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