What is the last branch off the aortic arch?
A. The brachiocephalic artery
B. The coronary artery
C. The left common carotid artery
D. The left subclavian artery
E. The right common carotid artery
D. The left subclavian artery
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Hummingbirds can hover because
A) They have large breast muscles that enable their wings to generate lift in the upstroke and downstroke. B) They burn only sugar and not fat. C) Their wings beat rapidly, often higher than 30 beats/sec. D) A and C
Which blood cell lacks a nucleus?
A) monocyte B) megakaryocyte C) erythrocyte D) lymphocyte E) basophil
Which of the following does NOT happen when you view objects up close?
A. the lens flattens B. the pupil constricts C. the ciliary muscles constrict D. the medial rectus muscles contract E. the parasympathetic division of the ANS responds
A mRNA containing introns is a
A. pre-mRNA. B. ribosomal RNA (rRNA). C. codon. D. proenzyme. E. gene.