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ashok tyagi from ,
Subject :NSO    Class : Class 7

Alveoli present in lungs

A increase the surface tension
B are few hundred in number
C have limited blood supply
D increase the surface area.


Ans 1:

Aditya kumar from Sapphire International School, Noida
Class : Class 8
ITS OPTION "D" as it increases surface area for intake of more oxygen

Ans 2:

Soumalya mallick from St. Stephens School, Kolkata
Class : Class 6
the answer is b

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