_____ prevent backflow of blood in the circulatory system
a. Veins
b. Valves
c. Arteries
d. Capillaries
B
Health Professions
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The ____ diamond in the four-diamond hazard placard warning system is for reactivity.
A. yellow B. white C. blue D. red
Health Professions
Which form of contraception prevents implantation of the blastocyst?
A. IUD B. Rhythm C. Oral contraceptives D. Chemical barriers E. Mechanical barriers
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