Fertilization - Egg Activation, Sperm Fusion, Zygote | Britannica
https://www.britannica.com/science/fertilization-reproduction/Events-of-fertilization
WEBFertilization is strictly species-specific, and the egg’s coating, the zona pellucida, plays an important role in the binding process between sperm and egg. In general, the biochemistry of the zona pellucida of one species differs from that of another, and thus it only matches up and binds with sperm of the appropriate species.
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