★ Cell Transport Quiz
How long does diffusion last?
A. Until the concentration of particles in the system is equal
B. Until a region in the system has a smaller concentration of particles than the other
C. Until a region in the system has a greater concentration of particles than the other
D. Until the particles disappear from the system
Select your answer:

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A. anterior cruciate ligament
B. posterior cruciate ligament
C. medial collateral ligament
D. lateral collateral ligament
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Where is the calcium absorbed from when PTH activates vitamin D?
A. stomach
B. intestines
C. esophagus
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