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Q.

Which of the following creatures have a pair of lungs with air sacs?


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a

Birds

b

Fish

c

Humans

d

Frogs 

answer is A.

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Detailed Solution

A pair of lungs with air sacs is present in birds.
All of us require air to survive. Both plants and animals benefit from oxygen and carbon dioxide in the air. Air sacs present in the lungs of birds are always open, allowing air to travel through them quickly. Fish require gills for breathing. Humans have lungs, and frogs breathe through their lungs and moist skin.
 
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