Answers

2016-03-03T21:34:04+05:30
1)thin walls for easy exchange
2)large surface area for maximum exchange
3)richly supplied by blood for maximum transport
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2016-03-03T23:13:09+05:30

alveoli Is the basic unit of lungs. they are the units that help in exchange of gases.

i) they are thin walled

so that the gases can be exchanged faster

ii) they are tiny in size

to increase in surface area of absorption

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