Select your answer:
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The Ear › ViewExternal ear consists of
A. Pinna, auditory canal and ear drum
B. Eustachian tube and oval window
C. Vestibule, semicircular canals and cochlea
D. Malleus, incus and stapes
Circulatory and Lymphatic System › View
Which of the following arteries has the highest concentration of carbon dioxide?
A. aorta
B. carotid artery
C. pulmonary vein
D. mesenteric artery