Blood in the pulmonary vein is oxygen rich, while in all of the other veins, it is oxygen poor.
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Explanation:
The tympanic membrane or eardrum serves as a divider between the outer ear and the middle ear structures. It is gray-pink in color when healthy and consists of three very thin layers of living tissue. The eardrum is very sensitive to sound waves and vibrates back and forth as the sound waves strike it.
Answer:
molecules, cells, tissues, organs, systems
Explanation:
Answer:
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