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Aves

Choose the co...

Question

Choose the correct answer from the alternatives given.
The respiratory medium flows unidirectionally ever the respiratory surface in the gas-exchange systems of:

A

mammals

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B

frogs

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C

birds

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D

insects

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Solution

The correct option is C birds
In birds, the air sacs permit unidirectional flow of air through the lungs. Unidirectional flow means that air moving through bird lungs is largely 'fresh' air & has a higher oxygen content. So, the correct option is 'birds'.

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