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Dispermia
Two sperm enter oocyte
Superfetatio
Observed in animals, not in humans. Two or more oocytes are fertilized by differrent men at same time.
SuperFECUNdatio
Two or more oocyter fertilized by different men at same time.
Partenogenesis
Specific process, new embryo only develops from oocyte, NO SPERM, under stong physical/chemical factors. Observed in nature & mammalians.