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