Multiple Choice
The role(s) of the sinuses include(s)
A) making the skull lighter.
B) production of mucus that moistens and cleans the air.
C) increasing surface area for gas exchange.
D) extra source of air and increasing surface area for gas exchange.
E) making the skull lighter and production of mucus that moistens and cleans the air.
Correct Answer:

Verified
Correct Answer:
Verified
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