____________________, tiny passages in birds' lungs, are the primary sites of gas exchange between the air and blood.
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Q6: The largest ratite, a large, flightless bird
Q7: _ is the term for the feather
Q8: In birds, the areas or tracts of
Q9: One of the parallel filaments projecting from
Q10: The portion of the female reproductive tract
Q12: In birds, unfeathered skin around the eye
Q13: Blood or _ feathers have blood flowing
Q14: Which of the following is the term
Q15: What kind of skin is tanned into
Q16: Dove-like birds that have short beaks and
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