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Paladinen [302]
3 years ago
5

The respiratory systems of birds are very efficient at providing oxygen to the blood, which is necessary for birds to expend the

energy necessary to fly. What feature of the bird respiratory system makes it more efficient than the respiratory systems of other animals?
A. a one-way air flow through the lungs and airways
B. a two-way air flow through the lungs and airways
C. bubble-like alveoli for gas exchange in the lungs
D. many tracheal tubes that connect the lungs to the skin
Biology
1 answer:
Murljashka [212]3 years ago
8 0

Answer:

B

Explanation:

Im sooo sorry if its not :(

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Multicellular

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To learn more about phlebotomy technicians with the given link

brainly.com/question/28061229

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Over heating an enzyme results in the enzymes loss of
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