na2neErikam5painez
na2neErikam5painez
21-12-2016
Biology
contestada
Why do birds have hallow bones?
Respuesta :
greenacres
greenacres
21-12-2016
The hollow
part of a
bird bone
isn't wasted space. In some
bones
, the
hollow
cavities contain extensions of the air sacs from the lungs. These air sacs help the
bird
to get the oxygen it needs to fly quickly and easily.
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