The reason that the majority of birds are polygamous is that both parents are required for care of the young.
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Q23: Most paleontologists agree that birds descended from
Q31: The digestive system contributes to the success
Q34: The nervous system contributes to the success
Q35: The flightless birds
A)have evolved mostly on islands.
B)are
Q37: A unique feature of the respiratory system
Q38: In migration,birds use
A)an innate direction sense.
B)the stars
Q39: An example of a bird with high-lift
Q40: Because the kidney of sea birds cannot
Q42: The enlargement at the lower end of
Q56: The photoreceptors in the retina that are
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