Referring to the figure of sperm penetration and fusion,match the lettered description with the correct numbered step in the figure.
A. Some of the zona pellucida is degraded by acrosomal enzymes.
B. Enzymes are released by cortical granules that harden the zona pellucida.
C. Sperm and egg fuse at the plasma membrane.
D. Sperm penetrates the corona radiata.
E. The sperm nucleus dissociates and enters the cytoplasm.
F. Additional sperm can no longer penetrate.
-Step III
Definitions:
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