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★ Circulation and Excretion Quiz
Which stores more oxygen under the same atmospheric conditions?
A. fresh water
B. sea water
Select your answer:
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Dental Caries › Viewxerostomia
A. decay in teeth
B. dryness of the mouth caused by reduction of saliva
Laser in Medicine › View
——— is an injection laser.
A. He-Ne laser
B. Semiconductor laser
C. Molecular gas laser
D. Solid state laser