Fertilization in mammals and sea urchins is similar in which way?
A) The first structure surrounding the egg with which the sperm comes in contact triggers the acrosomal reaction.
B) It occurs in the external environment.
C) Sperm recognition molecules occur on the egg plasma membrane.
D) Rises in calcium in the cytoplasm prevent entry by additional sperm.
E) The fast block to polyspermy occurs when there is a change in the electrical charge difference across the egg plasma membrane.
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