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2. What, if anything, is the difference between semen and sperm?
A. Sperm and semen mean the same thing; they are synonyms of each other.
B. Sperm are the actual reproductive cells; semen is the combination of these cells and other secretions from the male reproductive tract.
C. Sperm help neutralize acid in the urethra and vagina; semen provides nutrient for sperm.
D. Sperm are immature reproductive cells; mature cells are called semen when they leave the epididymis.
