Diffusion is:
a. A gaseous substance dissolving in a liquid substance
b. The active transport of gas with energy expended
c. The movement of a gas from a higher pressure to a lower pressure across a semipermeable membrane
d. The movement of a gas from a lower pressure to a higher pressure across a semipermeable membrane
Answer: c. The movement of a gas from a higher pressure to a lower pressure across a semipermeable membrane
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