Question: Only one sperm enters an egg because a. sperm have an acrosome. b. the corona radiata gets larger c. changes occur in the zona pellucida.

Only one sperm enters an egg because
a. sperm have an acrosome.
b. the corona radiata gets larger
c. changes occur in the zona pellucida.
d. the cytoplasm hardens.
e. All of these are correct.

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