A unique feature of the respiratory system in birds is the extensive system of nine interconnecting ____________.
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Q23: Most paleontologists agree that birds descended from
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Q35: The flightless birds
A)have evolved mostly on islands.
B)are
Q36: The reason that the majority of birds
Q38: In migration,birds use
A)an innate direction sense.
B)the stars
Q39: An example of a bird with high-lift
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Q42: The enlargement at the lower end of
Q42: Domesticated fowl aside,the starlings and the _
Q56: The photoreceptors in the retina that are
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