WindsorLynne
WindsorLynne WindsorLynne
  • 31-03-2017
  • Biology
contestada

Which characteristic(s) help birds maintain flight?

A. large heart
B. no bladder
C. air sacs
D. b and c
E. a, b, and c

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Torii1 Torii1
  • 31-03-2017
The answer is C.Air Sacs
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