What does the fact that eggs have the ability to recognize surface proteins on the sperm of their own species illustrate?

Question

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The ability of eggs to recognize surface proteins on the sperm of their own species is an example of gametic isolation. This is because it is a mechanism that prevents fertilization between sperm and eggs of different species. Gametic isolation can be a prezygotic reproductive barrier that prevents the formation of a hybrid zygote.

What Does the Fact That Eggs Have the Ability to Recognize