Inspiration, breathing in, is caused by:
A. increasing the volume of the chest cavity, which decreases the pressure in the chest cavity.
B. decreasing the volume of the chest cavity, which decreases the pressure in the chest cavity.
C. increasing the volume of the chest cavity, which increases the pressure in the chest.
D. decreasing the volume of the chest cavity, which increases the pressure in the chest cavity.
Answer: A
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