9) Alveoli increase the surface area in the lungs to allow
a)More nutrients to be absorbed
b)to breathe slowly
c)To breathe faster
d)More Oxygen and Carbon dioxide to exchange
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Alveoli contains many elastic fibres which allows it to expand and recoil according to the volume of air breathed in. When expanding alveoli's surface area is increased and the diffusion rate is faster.
to breathe faster
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B. More oxygen and a carbon dioxide to exchange
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