There are about ________ alveoli in lungs which provide surface area for exchange of gases.
A. 200
B. 5 thousands
C. 60 lakhs
D. 700 million
Answer:D
There are about ________ alveoli in lungs which provide surface area for exchange of gases.
A. 200 B. 5 thousands C. 60 lakhs D. 700 million