Which statement is not correct concerning fertilization?
A. Once a sperm has penetrated the oocyte, the zona pellucida hardens to prevent additional sperm from penetrating.
B. Fusion of pronuclei produces a haploid nucleus.
C. Digestive enzymes released from the acrosome eat away the intercellular connections in the corona radiata.
D. Only the sperm nucleus enters the oocyte cytoplasm.
Answer: B
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