More than one sperm is prevented from fertilizing an egg by all of the following mechanisms except:
A. Opening sodium channels in the plasma membrane causes a change in the electrical charge of the membrane.
B. Secretion of material from cortical granules pushes sperm away from the already fertilized egg.
C. A slow block to polyspermy occurs.
D. Meiosis II is completed by the egg.
E. A fast block to polyspermy occurs.
Answer: D
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